An atmospheric pressure, quartz flow reactor was used to examine the NO oxidation to NO 2 behavior for the 600 to 1100 K temperature range and residence times from 0.16 to 1.46 s. What is the mass in grams of 1 nitrogen dioxide molecule? Copyright 2023 MassInitiative | All rights reserved. Beetroot (Beta vulgaris L.) is a rich source of nutrients and bioactive substances such as fibre, carbohydrates, and phenolic compounds.In addition, this vegetable contains macro- and microelements such as potassium, iron, calcium, copper, sodium, and zinc, as well as vitamins B 1, B 2, B 3, B 6, biotin, and B 12.Red beetroot owes its characteristic intense colour to betalain pigments . Answer link. As is conventional, these cells were cultured under atmospheric oxygen concentrations (21% oxygen). In C2H5OH, % by mass of oxygen=16/46*100 =34%, Which of the following has highest percentage of oxygen by mass? do you mean the percentage by mass of nitrogen or oxygen in The mass of this empirical formula = 14 + 2x16 = 46 section 9.2 1. rgy in the sample of Cheetos. Nitrogen Oxides (6 items) (Drag and drop into the appropriate area below) N203 NO NO N202 NO2 N2O %O by Mass 50% or Less o More The ratio of mass percent of C and H of an organic 24. The procedure to use the percent composition calculator is as follows: Step 1: Enter the chemical formula in the input field. What is the mole fraction of oxygen in dichlorine heptoxide? That is the mole fraction of hydrogen is 2/3 (.6667) and the mole fraction oxygen is 1/3 (.3333), meaning the mole fraction for water is 67% hydrogen and 33% oxygen. C. CH_3CH_2CH_2Cl. The mask was not a function mask. Combustion generated oxides of nitrogen are emitted predominantly as nitric oxide, N0, a . In this article, we shall study the calculation of number of moles, number of atoms, and molecules in a given moles. which compound has the highest percent composition by mass of oxygen?-CaCO3-CaSO3-Li2CO3-Li2SO3. These applications will - due to browser restrictions - send data between your browser and our server. 412 ppm. 90%. The mass of oxygen (O) per gram of carbon (C) is: 69.6). Galena, a . 189.36 g mol1 is the molar mass of zinc nitrate. Please click here to see any active alerts. If one molecule of the above . Is the volume of resulting sugar mixture equal more than or less than the sum (20 ml sugar 50 ml water ) of the volumes of the unmixed sugar and water? Only emails and answers are saved in our archive. It's mass percent as 30.4% and then for oxygen, you could plug it into this formula. Calculate the percentage by mass of oxygen in the following compounds a. NO2 b. CH;COOCH3 c. Cr(NO3)3 d. (NH4)2 CO3 Expert Solution. >. We use the most common isotopes. The cookie is used to store the user consent for the cookies in the category "Analytics". Cookies are only used in the browser to improve user experience. Also, because a sample of a pure substance consist of molecules or ionic compounds of the same formula, the percent or fractional value does not depend on the sample size. Robert E. Belford (University of Arkansas Little Rock; Department of Chemistry). The mass percentage of the Nitrogen = (14/ . Hint: The percentage composition of N and H is given in the question. Calculate the percentage composition of all the elements present in lead nitrate. Mass percent of any element in a compound is 100 time the mass of the element divided by the total mass, \[\mathrm{Mass\: \%\: element=\dfrac{mass\: element}{mass\: compound}\times100\%}\]. NO2 forms from emissions from cars, trucks and buses, power plants, and off-road equipment. here, it says, determined the percent composition of nitrogen and oxygen with a nitrogen dioxide. How do you calculate the mass percent composition of.? 15.999 g mol1 is of course the molar mass of the oxygen atom. Hill formula, elemental composition, mass percent . E. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Therefore, option (A) is correct. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. multiply by 100. 7 How to calculate the mass percent of hydrogen? When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Thus, percent by mass of each element in a compound depends on the amount of that element used to make the compound. SURVEY . Calculate the percentage composition of iron in ferric oxide, Fe 2O 3. one year ago. Given, the molecular formula of the compound is NO. from an increase in oxygen levels in your training sessions. An experimental and detailed chemical kinetic modeling investigation of the temperature-dependentrole of n-butane and n-pentane oxidation on the NO to NO 2 conversion is presented. Divide each percentage by the atomic mass of that element. 3 What is the percentage composition of nitrogen? One of our academic counsellors will contact you within 1 working day. b.NO2. Nitrogen: 30.4 / 14 = 2.1714 The mass percentage of the Nitrogen = (28/76) 100 = 36.84 %. The mass percent composition of nitrogen in NO2 is 30.4%. The breadth, depth and veracity of this work is the responsibility of Robert E. Belford, rebelford@ualr.edu. First, calculate the molar mass of the compound and then the percentage of each element by dividing the total mass of the element present in the compound by the molecular mass of the compound multiplied by 100. It's a good option to have. A) CaCl2 B) CO2 C) CS2 D) SO2 E) OF2 A) CaCl2 2. While 12 C, having a mass of exactly 12 u (atomic mass unit) is more abundant compared to . Krisha. Step 1: Find the mass of O 2(g . The mass percentage of the Nitrogen = (14/46) 100 = 30.4 %. The measurements show that addition of NO 2 to CH 4 /O 2 /N 2 2 to CH 4 /O 2 /N 2 We receieved your request, Stay Tuned as we are going to contact you within 1 Hour. The percent by mass of each element in a compound depends on the amount of element present in the compound. (1) h20 (2) co2 (3)caco3 (4) c2h5oh, 'x' gm of a compound A3B2C5 contains 'y' gm of A atoms Using above information Match the following, the reduction of acid sensitive compounds is carried out by. Therefore, multiply the molecular mass of Hydrogen by 2, 1.00794 X 2 = 2.01588; and leave the molecular mass . necessary. Dioxygen - O 2. Download scientific diagram | High-resolution mass spectra of isoprene SOA formed under low-NO x (A) and high-NO x (B) conditions with elemental contributions to each mass-to-charge ratio shown. There are many isotopes of carbon but only Carbon -12 ( 12 C) and Carbon-13 ( 13 C) have exist naturally and more stable among the others. . Use the calculator below to balance chemical equations and determine the type of reaction (instructions). So when we say the fractional or percent composition, we need to identify how we are determining it. So here we have both the mass percent off nitrogen and oxygen giving the percentages of all the compounds with all the elements within the compound are classified as the percent composition of the compound. the molecular formula of the compound is NO. the molecular formula of the compound is NO. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. An official website of the United States government. . Lymphocytes circulate through the blood and lymphatic system and, within secondary lymph organs, the physiological oxygen concentration may be as low as 5% [46]. This cookie is set by GDPR Cookie Consent plugin. A. CH_3CH_2OH. Then figure out what the total cost of the trip would be.? This yields a significant flow rate increase compared with natural gas (~14% more), resulting from the need to maintain a specified heat . Then work out the mass of the number of moles of nitrogen / d.SiO2 Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. NO 2 forms from emissions from cars . Over 98 percent of man-made N0, emissions result from Combustion with the majority due to stationary sources. Air is a mixture of several gases, where the two most dominant components in dry air are 21 vol% oxygen and 78 vol% nitrogen.Oxygen has a molar mass of 15.9994 g/mol and nitrogen has a molar . One mole of water weights 18 grams, with 2 grams being hydrogen and 16 being oxygen, so the fraction of hydrogen is 2/18 (0.1111) and the fraction oxygen is 16/18 (.8889), and note that the . You find a certain stock that had returns of 15 percent, -17 percent, 23 percent, and 11 percent for four of the last five years. So if we want to produce 3.91 moles of iron three oxide, we can calculate the moles of oxygen required Knowing we need three moles of oxygen to produce two moles of Iron three oxide, just like a recipe. CO 2. NO2 primarily gets in the air from the burning of fuel. N203 is the answer, if i am wrong im sorry! 96.0% b. N2O (subscript 2 on nitrogen) NO. Explain why you can answer part (A), even though the calculation in Question 4 related only to the water. NO 2. which compound contains the largest percent by mass of oxygen?-CO2-NO2-SO2-SIO2. Nitrogen Peroxide NO2 Molar Mass NO2 Oxidation Number. Divide each percentage by the atomic mass of that element. This cookie is set by GDPR Cookie Consent plugin. , equal to the one in the exit stream: group of answer choices the pollutant is conservative the lake is completely mixed steady- state conditions prevail first-order reaction kinetic no pollutant accumulation in the lake, A 75 kg Skydiver is spotted at a height of 1000 m above the Earth's surface how much GPE does the skydiver possess, calculate the mole in 4.5 molecules of carbon dioxide, Approximately how long will it take for 75 percent of the initial amount of C25H30N3. what makes muscle tissue different from other tissues? 2 How do you find the percent composition of NO2? What is the volume occupied by a #24*kg# mass of nitrogen gas at a temperature of #308.2*K#, and a gauge pressure of #50*kPa#? term-10. For example, water has 3 atoms, one hydrogen and two oxygens. We are given that the sample of the unknown compound contains 5.6 mol of nitrogen and 11.24 mol of oxygen. saturated analogue for this molecular formula is CHIS. (The molar mass of sulfur is 32.065 g/mol.) D. CH_3CH_2CH_3. a. urea, NH2CONH2 b. ammonium sulfate, (NH4)2SO4 c. ammonium hydrogen sulfate, NH4HSO4; Which of the following compounds has the highest vapor pressure at 25 degrees C? Which is the correct assumption used to calculate the steady-state concentration of a pollutant in the lake, so that the concentration in the lake is Molecular weight/molar mass of NO 2: 46.006 g/mol: Density of Nitrogen dioxide: 1.880 g/dm 3: . D. 600 sec. What is the mass percent of oxygen in dichlorine heptoxide? So then when we do that, we're gonna get here for nitrogen. mass % O = (32.00 g / 44.01 g) x 100. mass % O = 72.71 %. Determine the number of moles of compound and the number of moles of each type of atom in each of the following: (a) 25.0 g of propylene, C 3 H 6. Please read AddThis Privacy for more information. The molecular mass of the NO = 30 g/mol. The molar mass of acetic acid (CHCOOCH): = 3 12.0 + 2 16.0 + 6 1.0. Molar mass of *Fe(NO2)2 is 147.8560 g/mol. Hill formula, elemental . So we're going to need 0.833 moles of molecular oxygen. oxygen in one mole of nitrogen oxide Nov 18, 2016. Browse the list of (a) 2 and 3 . Density and specific weight at varying temperature, Dynamic (absolute) and kinematic viscosity, Properties at gas-liquid equilibrium conditions, The composition of air is unchanged until elevation of approximately, The average air temperature diminishes at the rate of, "One Standard Atmosphere" is defined as the pressure equivalent to that exerted by a. Using nitrogen dioxide (NO2) and carbon monoxide (CO) data measured by the Tropospheric Monitoring Instrument (TROPOMI), together with fire counts and fire radiative power (FRP) from MODIS, we analyzed the temporal and spatial variation of NO2 and . 1 mole of gas at STP = 22.4 L 1. use of HGH for six months increased Lean Body Mass by an astounding 8.8 percent.. The percentage of an element in a compound is 100 times the fraction, so for water the mass percent hydrogen is 11.11% and the mass percent oxygen is 88.89%. It's mass percent as 30.4% and then for oxygen, you could plug it into this formula. Some of our calculators and applications let you save application data to your local computer. = 46.0 g/mol. Nitrogen Dioxide NO2 decomposes upon heating to form nitric oxide and oxygen according to the following equation: 2NO2 (g) > 2NO (g) + O2 (g) At the beginning of an experiment the concentration of nitrogen dioxide in a reaction. SO 2. A: % element = n x atomic mass molecular mass of compound x 100 where element = Oxygen. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Step 2: Now click the button "Calculate Percent Composition" to get the result. If you are measuring the mass, it is mostly oxygen. The mass percentage of the Nitrogen = (14/44) 100 = 31.81 %. The formula weight of a substance is ________. Why SJF Cannot be implemented practically? Problem 2 C q Hgo & Degree of unsaturation. Calculate the percentage by mass of oxygen in the following compounds a. NO2 b. CH;COOCH3. Oxygen: 4.35 / 2.1714 round to 2 This website uses cookies to improve your experience while you navigate through the website. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. Mass percent composition is also known percent by weight. An oxygen-blown, entrained-flow IGCC plant will typically produce syngas with a heating value ranging from 250 to 400 Btu/ft 3 (HHV basis), which is considerably lower than the 1000 Btu/ft 3 for natural gas. Calculate the percent oxygen by mass in 0.370 kg of trinitrotoluene (TNT, C7H5N3O6). Percentage of water of crystallization for BaI2. Hey there! Thanks. B. CH_3OCH_3. Want to see the full answer? The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. %Oxygen = Mass of oxygen Formula mass of compound 100%. Secure .gov websites use HTTPS what would be the percent H in a 20.000 g sample? Want to see the full answer? c.SO2. These relative weights computed from the chemical equation are sometimes called equation weights. (c) 25 lb of the herbicide Treflan, C 13 H 16 N 2 O 4 F (1 lb = 454 g) A) identical to the molar mass. O 2.65 x 1023 total N atoms O 9.31 x1023 total. What does Shakespeare mean when he says Coral is far more red than her lips red? Video \(\PageIndex{1}\) shows a technique to calculate the percent composition of a formula that minimizes the amount of work you need to do. So the fraction of oxygen is 1/3 (33.3%) and the fraction of hydrogen is 2/3rd (66.7%), as exemplified in the left pie chart of Figure \(\PageIndex{1}\). TOC = Total Carbon (TC) - Inorganic Carbon (IC) TOC = all carbon atoms covalently bonded in organic molecules. 9.5 sites of unsaturation Degree of unsaturation - 05. su - 20+2 +N-H-X - 2x8+2-8-0. To complete this calculation, you have to know what substance you are trying to convert. Forecasting urban NO2 concentration is vital for effective control of air pollution. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. Figure \(\PageIndex{1}\): Mole (left) and mass (right) fractions (or percentages) of oxygen and hydrogen in water. Statistical study of spatio-temporal distribution of precursor solar flares associated with major flares. The molecular weight (or molar mass) of a substance is the mass of one mole of the substance, and can be calculated by summarizing the molar masses of all the atoms in the molecule.. The largest mass percentage of nitrogen in NO. Finding the mass percent requires the molar mass of the elements in the compound in grams/mole or the number of grams used to make a solution. So one molecule of water has the same percent composition as a gallon of [pure] water. You also have the option to opt-out of these cookies. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. NO2 is used as the indicator for the larger group of nitrogen oxides. JavaScript appears to be disabled on this computer. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. . SiO 2. Here's how to do one.. % composition = 100 * (Mass of element) (Mass of compound) Mass N = 2 * 14 = 28 g The percent composition can be found by dividing the mass of each component by total mass. Since both of these elements are diatomic in air - O2 and N2, the molar mass of oxygen gas is 32 g/mol and the molar mass of . Remember here this will be the grams of nitrogen within the grams of the compound. Dioxygen - O 2. Share sensitive information only on official, secure websites. View solution. Times 100 and for oxygen, it'll be grams of oxygen divided by the grams of the compound. 1st attempt Part 1 (1 point) See Periodic Sort the nitrogen oxides listed below according to their percent by mass of oxygen. These cookies will be stored in your browser only with your consent. NO 2 is used as the indicator for the larger group of nitrogen oxides.. NO 2 primarily gets in the air from the burning of fuel. What is NO 2 and how does it get in the air?. Mass Percent of a Solution Made Easy: How to Calculate Mass % or Make a Specific Concentration, How To calculate Percentage Mass | Chemical Calculations | Chemistry | FuseSchool, GCSE Science Revision Chemistry "Calculating Percentage by Mass". An official website of the United States government. Air is a mixture of several gases, where the two most dominant components in dry air are 21 vol% oxygen and 78 vol% nitrogen. So the relationship will then be 3-2, The moles, Iron three oxide will cancel And we'll be left with moles oxygen 5, 87 moles oxygen.. a 10.000g sample of water (H2O) contains 11.19% H by mass. Nitrogen Dioxide, NO2. What is the molecular weight of nitric oxide? Do clownfish have a skeleton or exoskeleton. An increasing percentage of US waste methane (CH4) emissions come from wastewater treatment (10% in 1990 to 14% in 2019), although there are limited measurements across the sector, leading to large uncertainties in current inventories. From the formula we can say that higher the mass of the element, higher will be its mass percentage. = 32.0 g/mol. Legal. Q: Calculate the total number of N atoms in 23.8 g N2O5. How do you find the percent composition of NO2? Check out a sample Q&A here. Mass percent of any element in a compound is 100 time the mass of the element divided by the total mass. Percent composition oxygen = 32.0/46.0 x 100. Give some Synthetic application of Diethyl Malonate? % by mass of oxygen= 80/100*100 =80%. Answer: caco3 has the highest percentage of oxygen by mass. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. Step-by-step explanation. . You could also say that we know that 100% of the compound is made up of just nitrogen and oxygen. MASS - VOLUME and VOLUME - VOLUME PROBLEMS Since chemical equations for chemical reactions state the relative numbers of . Two distinct periods (the polluted period (PP, before October 3rd) and the cleaning period (CP, October 3rd to October 16th)) were determined based on the 24 h backward trajectories of 50 m, 500 m, and 1000 m arriving at the sampling site at 12:00 every day . Li2CO3. Similar questions. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! B) 164.0. = 74.0 g/mol. It is calculated as, Acetic acid has two oxygen atoms so, the mass of O = 2 16.0. Air is usually modeled as a uniform (no variation or fluctuation) gas with properties averaged from the individual components. \[\mathrm{mole\: fraction\: H=\dfrac{mole\: H}{total\: mol\: in\: compound}}\], \[\mathrm{mole\: fraction\: H=\dfrac{2\: mole\: H}{3\: mol}\: =\: 0.667}\]. This paper proposes a hybrid deep learning model for predicting daily average NO2 concentrations on the next day, based on atmospheric pollutants, meteorological data, and historical data during 2014 to 2020 in five coastal cities of . Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. multiply the subscripts in the empirical formula by this number by mass: Percent to mass Mass to mole Divide by small Multiply till whole (c) 32.79% Na, 13.02% Al, and 54.19% F The percentage by mass of an element in a chemical compound can be described as the number of parts by mass of the element contained in 100 parts by mass of a chemical compound. 92.0 / 46 = 2 . No2. answer choices . Give the name and formula of the compound whose molecules consist of two chlorine atoms and one oxygen atom. Usually, but not always, chemists use percentage for mass and fraction for moles (number of particles). So you could say 100% minus 34 30.4% gives us also the percentage of oxygen, so this will come out to 68.6% or actually 69 0.6%. Nitrogen Peroxide NO2 Molar Mass NO2 Oxidation Number. nitrogen oxide? How do you calculate the mass percent composition of nitrogen? Question 16. Oxygen has a molar mass of 15.9994 g/mol and nitrogen has a molar mass of 14.0067 g/mol. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. Which compound contains the largest percent by mass of oxygen? Atomic weight Atoms Mass percent; Iron: Fe: 55.845: 1: 37.7699: Nitrogen: N: 14.0067: 2: 18.9464: Oxygen: O: 15.9994: 4: 43.2837: Mass percent composition Atomic percent composition; Formula in . The bushfires that occurred in Australia in late 2019 and early 2020 were unprecedented in terms of their scale, intensity, and impacts. Convert between CsH7(NO2)3 weight and moles . 390 ppm and 2020 aprox. AddThis use cookies for handling links to social media. Necessary cookies are absolutely essential for the website to function properly. The percent by mass of oxygen in N2O4 is 69,56 %. AS DISCUSSED . This cookie is set by GDPR Cookie Consent plugin. What is the empirical formula for the copper oxide salt determined in the data 3. They asked what mass percent of option was in the variant part. a) 153 b) 690 c) 368 d) 460 e) 1150 . Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. Longer exposures to elevated concentrations of NO2 may contribute to the development of asthma and potentially increase susceptibility to respiratory infections. The molar mass of the N2 molecule is therefore 28.02 g/mol. The cookies is used to store the user consent for the cookies in the category "Necessary". Solution: The chemical formula of the unknown compound is NxO2, where x is a whole number. Transcript. The mass percent of oxygen in SO2 is 50 %. Other nitrogen oxides include nitrous acid and nitric acid. Register Yourself for a FREE Demo Class by Top IITians & Medical Experts Today ! If you go three significant figures, it's 26.7. Nitrogen: 30.4 / 14 = 2.1714 Oxygen: 69.6 / 16 = 4.35 compare these and divide by the smallest, round if necessary. JavaScript appears to be disabled on this computer. To calculate the percent composition, the masses of C, H, and O in a known mass of C 9 H 8 O 4 are needed. a.CO2. Relative molar mass, Mr = 14.0 +16.0 x 2. In your explanation, refer to evidence from the experiment and appropriate chemical laws. 225 sec. = 69.6%. DOC = Carbon passed through 0.45 micrometer filter. 1.00 mole = 6.02 10 23 representative units. \[\mathrm{Mass\: \%H=\dfrac{mass\: H}{mass\: compound}\times100\%}\], \[\mathrm{Mass\: \%H=\dfrac{2g}{18g}\times100\%}=11.11%\]. NOTE: Even though mass has units, mass percent is unit-less, and so care needs to be taken to identify what the percent or fraction relates to. A. See Solution. Since both of these elements are diatomic in air - O2 and N2, the molar mass of oxygen gas is 32g/mol and the molar mass of nitrogen gas is 28 g/mol. What is the mass percent composition of nitrogen in . 1) According NASA CO2 level in 1960 aprox. Divide this by the mass of one mole of nitrogen oxide and then E) the weight of a sample of the substance. You could also say that we know that 100% of the compound is made up of just nitrogen and oxygen. NO N2O NO2 N2O3, Another student points out that Jasmines calculation relates only to the water. People with asthma, as well as children and the elderly are generally at greater risk for the health effects of NO2. Nitrogen: 2.1714 / 2. . Convert between *Fe(NO2)2 weight and moles . Nitric Oxide molecular weight Molar mass of NO = 30.0061 g/mol Convert grams Nitric Oxide to moles or moles Nitric Oxide to grams, Mass percent of Oxygen = 16.0 59.0 100% = 27.1% Mass percent of Hydrogen = 5.00 59.0 = 8.50% Always check the validity of the answer by adding up all the percentages 40.7 +23.7 + 27.1+ 8.50 = 100%. The cookie is used to store the user consent for the cookies in the category "Performance". If we look at nitrogen dioxide, it's composed of one nitrogen, and it's composed of two oxygen's. 1 9 % respectively. CHEMISTRY STOICHIOMETRY WORKSHEET. Q: Determine the percentage compo. Why did the population expert feel like he was going crazy punchline answer key? Nitrogen: 2.1714 / 2.1714 = 1 What. It should also be noted that as the following two videos show, some formulas have the same percent composition, even though they are different molecules, like acetylene (C2H2) and benzene (C6H6).
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