1) Iron (Fe), the main component of steel, is the most important metal in industrial society. How many Fe atoms are in 95.8 g of Fe? a) 1.04 x 10^24 atoms Fe b) 1.04 x 10^20 atoms Fe 2) Information that contained in a balanced equation except, a) Molecules b) Mass (g) c) Amount (mol) d) Molar mass (g/mol) 3) What is atomic mass? a) Mass of an isotope of an element b) Average of the masses of the naturally occurring isotopes of an element weighted according to their abundance c) Mass of 1 mole of chemical entities 4) Glucose (C6H12O6) generates chemical potential energy. What is the mass percent of hydrogen in glucose? a) 39.99% b) 6.714% c) 53.29% d) 5.432% 5) Elemental analysis of a sample of an ionic compound showed 2.82 g of Na, 4.35 g of Cl, and 7.83 g of O. What is the empirical formula and name of the compound? a) Na2ClO3 is sodium chlorate b) NaClO4 is sodium chlorate c) NaClO4 is sodium perchlorate d) Na2ClO3 is sodium perchlorate 6) Function of erythrose, C4H8O4 a) Component of nucleic acids b) Part of sugar metabolism c) Major energy source of cell d) Biological preservative 7) Hydrazine(N2H4) and dinitrogen tetraoxide(N2O4) ignite on contact to form nitrogen gas and water vapor. How many grams of nitrogen gas form when 1.00x10^2 g of N2H4 and 2.00x10^2 g of N2O4 are mixed? a) 28.02 g N2 b) 131 g N c) 131 g N2 d) 150 g N 8) Silicon carbide (SiC) is made by reacting sand (silicon dioxide, SiO2) with powdered carbon at high temperature. Carbon monoxide is also formed. What is the percent yield if 51.4 kg of SiC is recovered from processing 100.0 kg of sand? a) 77.0% b) 66.73% c) 40.10% d) 73.0% 9) How many grams of solute are in 1.75 L of 0.460 M sodium monohydrogen phosphate buffer solution? a) 101 g Na2HPO3 b) 114 g Na2HPO3 c) 114 g Na2HPO4 d) 101 g Na2HPO4 10) A 0.10M HCl solution is used to stimulate the acid concentration of the stomach. How many liters of "stomach acid" react with a tablet containing 0.10g of magnesium hydroxide? a) 3.4 x 10^-2 L HCl b) 3.4 x 10^-3 L HCl c) 2.4 x 10^-2 L HCl d) 2.4 x 10^-3 L HCl

Stoichiometry of Formulas and Equations

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Угради

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