Question

8) Methanol, CH3OH, is derived from natural gas and is blended with gasoline to make 8) gasohol. If the combustion of methanol produces carbon dioxide and water, what is the coefficient of oxygen in the balanced equation? _cH3OH(g) +-O2(g) spark-CO2e) . _H2Og) A) 1 B) 3 D) 2 E) none of the above 9) What is the mass of 2.50 L of sulfur dioxide gas, SO2, at STP? 9) A) 56.0 g B) 25.6 g C) 1.14 g D) 0.875 g E)7.15 g 10) What is the volume of 1.20 1022 molecules of nitric oxide gas, NO, at STP 10) A) 0.447 L B) 5.02L C) 0.0199 L D) 224 L E) 1120 L 11) Which of the following is evidence of a chemical reaction? A) A precipitate is formed. B) A gas is produced. C) An energy change is observed. D) all of the above E) none of the above 12) 12) The taste of sour milk is lactic acid. What is the molecular formula for lactic acid if the percent composition is 40.00% C, 6.71% H, 53.29%0, and the approximate molar mass is 90 g/mol? A) C6HOs B) CHO C) C3H603 D) CHO2 E) CH20 13) What is the molar mass of nitroglycerin, C3H503(NO2)3? 13) A) 227.11 g/mol B) 280.16 g/mol C) 405.27 g/mol D) 275.11 g/mol E) 225.09 g/mol 14) If 0.300 mol of lead combines with 0.300 mol of sulfur, what is the empirical formula of the 14) lead sulfide product? A) Pb353 B) PbS2 C) PbS D) Pb2S E) none of the above 15) If the density of an unknown gas is 1.96 g/L. at STP, what is its molar mass? )224 g/mol D) 114 gmol 15) A) 43.9 g/mol B) 196 g/mol E) 19.6 g/mol

Answer 1