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### 15 Cards in this Set

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 The complete combustion of methane is given by the equation CH4(g) + 202(g) -2H20(g) + CO2(g). If 50L of methane at STP are burned, how many liters of carbon dioxide at STP will be produced? a) 50L, b) 16.6 L, c) 25 L, d) 100 L need answer The equation va/v8 = the square root of M8/ the square root of Ma is an expression of a) Graham's law, b) Avogadro's principle, c) Gay-Lussac's law, d) Boyle's law a) Graham's law When Gay-Lussac's law of combining volumes holds, which of the following can be expressed in ratios of small whole numbers? a) pressures before and after reaction, b) volumes of gaseous reactants and products, c) Kelvin temperatures, d) molar masses of products and reactants b) volumes of gaseous reactants and products The law of combining volumes applies only to gas volumes a) measured at constant temp. and pressure, b) that equal 1 L, c)that equal 22.4 L, d) measured at STP a) measured at constant temperature and pressure Equal volumes of diatomis gases, under the same conditions of temperature and pressure, contain the same number of a) protons, b) ions, c) molecules, d) Dalton's "ultimate particles" c) molecules At constant temperature and pressure, gas volume is directly proportional to the a) molar mass of the gas, b) number of moles of gas, c) density of the gas at STP, d) rate of diffusion b) number of moles of gas The molar volume of a gas at STP is all of the following except, a) the volume occupied by one mole of the gas, b) 22.4 g, c) 22.4 L, d) the volume occupied by one molar mass. b) 22.4 g The volume occupied by one mole of oxygen at STP is a) 11.2 L, b)22.4L, c)16.0 L, d) 32.0 L b) 22.4 L The molar mass of a gas at STP is simply the density of the gas a) multiplied by the mass of one mole, b) divided by the mass of one mole, c) multiplied by 22.4 L, d) divided by 22.4 L. d) divided by 22.4 L The value for the gas constant is a) 0.08221 L.atm/mol.K, b) 0.0281 L.atm, c) 0.0281 L .atm/mol. K, d) 0.0821mol.K o a) 0.0821 L.atm/mol.K To use the ideal gas law to determine the molar mass of a gas a) the mass of a molar volume of that gas must be determined, b) the mass of any known volume of the gas may be used, c) a volume of less than 22.4 L may not be used, d) the volume measurement must be mad at STP need answer The ideal gas law is equivalent to Boyle's law when a) Avogadro's number is reached, b) R equals zero, c) the pressure is 1 atm, d) the number of moles and the temp. are constant. d) the number of moles and the temp. are constant In a chemical equation, the coefficients for reactants and products that are gases indicate a) volumes at STP, b) volume ratios, c) molar masses of each substance, d) densities need answer In the reaction C(s) + O2(g) -CO2(g), 3.0 L of O2 will yield what volume of CO2 at constnat temperature and pressure? a) 1.5 L, b) 0.5L, c, 2.0L, d) 3.0L need answer Suppose that two gases with unequal molar masses were injected into opposite ends of a long tube at the same time and allowed to diffuse toward the center. They should begin to mix a) at the end that held the heavier gas, b) closer to the end that held the heavier gas, c) closer to the end that held the lighter gas, d) exactly in the middle b) closer to the end that held the heavier gas