HF. answered Sep 18, 2016 by NetworkHinch . a) CrO b) CrO2 c) Cr2O2. Finally, the molar mass of sulfur is 32.06, and there is only one sulfur atom in the compound, so the mass will be 32.06 + 87.62 = 119.68. 0°C and 1 atm. ** The percent composition: is the percent by mass of each element in a compound. 2NaHCO3 + heat -----> Na2CO3 + H2O + CO2 Calculate the percent composition by mass … Percent of mass of one element in a compound is expressed as a ratio of mass contribution to the element and the total molecular mass of the compound multiplied by 100%. 85% (159 ratings) Problem Details. The mass spectrum of methylbromide has two prominent peaks of equal intensity at m/z 94 (M) and 96 (M+2) and then two more at 79 and 81 belonging to the bromine fragment. A) MnO B) MnO2 C) Mn2O3 D) Mn3O2 E) none of the above. SO2. The percent composition of a compound is calculated with the molecular formula: divide the mass of each element found in one mole of the compound by the total molar mass of the compound. SO3. Mass percent composition of N = mass contribution of N/molecular mass of K 3 Fe(CN) 6 x 100%; Mass percent composition of N = 84.06 g/mol/329.27 g/mol x 100%; Mass percent composition of N = 0.2553 x 100%; Mass percent composition of N = 25.53% That means, the molar mass of is equal to, Finally, calculate the percent of ion by mass as follows: Therefore, percent … H2SO4. Of the compounds listed in the question, water has the highest percent mass of hydrogen. ... the percent by mass of each element in a compound. Avogadro's number. It is simply calculated using a basic formula dividing the mass of the element (or solute) by the mass of the compound (or solution). For ex. a. CO b. CO2 c.H2CO3 d.H2CO. A) MnO B) MnO2 C) Mn2O3 D) Mn3O2 E) none of the above. Mass percent composition describes the relative quantities of elements in a chemical compound. Which of the following compounds has the highest mass percent of "O"? To find the percent composition of oxygen in Na2O, find the total molar mass of the compound. H2SO3. (You should not have to perform any detailed calculations to answer this question). If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Subtract to find the mass of oxygen in the compound. Answer Save. Dr W. Lv 7. Powerpoint presentation with working example on how to calculate the percentage of an element in a compound. H2S . The average 70 kg (150 lb) adult human body contains approximately 7 × 10 27 atoms and contains at least detectable traces of 60 chemical elements. ** Percent composition is obtained by dividing the mass of each element in 1 mole of the compound by the molar mass of the compound and multiplying by 100 percent. Mass percent tells you the percentage of each element that makes up a chemical compound. 1 decade ago. (mass of strontium) / (mass of compound) * 100% = (percent mass of Strontium) 1. b. HClO 2. c. HClO 3. d. HClO 4. The empirical formula for a compound that is 1.2% H, 42.0% Cl, and 56.8% O is a. HClO. so let's assume we have 1 mole of each compound. A. #H_2O# In the calculations below, I have rounded the masses to whole numbers. Answer: c 10. which of the following compounds has the highest oxygen content, by weight? It is defined as a grams of the solute per grams of solution with 100 percent solution. (a) 2 and 3 (b) 1 only (c) 1 and 2 (d) 1, 2 and 3 6 Answers. H2S . Dr W. Lv 7. 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. • Example – Ethanol’s molecular formula is C 2 H 6 O. which compound has the highest mass percent S? 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