Quiz 3A - Chem127 Quiz3A 1 Chem127 Quiz3A 2 R = 0.08206...

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Chem 127 Quiz 3A 1
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Chem 127 Quiz 3A 2 R = 0.08206 L atm/mol K
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Chem 127 Quiz 3A 3 Points Earned Points Possible 15 Name: Quiz 3A 1. (1 point) If the temperature of a sample of gas is decreased at constant volume, the average velocity of the molecules _______ and the average number of collisions with the wall, per unit area, per second_______. A. remains the same, increases B. remains the same, remains the same C. remains the same, decreases D. decreases, decreases E. increases, increases 2. (5 points) How many liters of phosphine (PH 3 ) can form when 32.5g of phosphorous reacts with 86.0L of hydrogen gas react at STP (0 ° C and 1.00 atm, the temperature and pressure are held constant during the reaction). P 4 (s) + 6H 2 (g) 4PH 3 (g) First determine the limiting reactant and then use those moles of phosphine to determine the volume formed: 32.5 g P 4 " 1 mole 123.88 g " 4 moles PH 3 1 mole P 4 = 1.05 moles PH 3 PV = nRT , n = PV/RT n H 2 = (1.00 atm)(86.0L) (0.08206L atm/mol K)(273K) = 3.84 moles H 2 " 4 moles PH 3 6 mole H 2 = 2.56moles PH 3 So, phosphorous is the limiting reactant V = nRT P = (1.05 moles )(0.08206)(273
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