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# PILOT EXAM 3 Answer Key - (Chapters5and6 1 When volume of...

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Answers to  PILOT Exam Nr 3   (Chapters 5 and 6) Pts 1. When volume of the gas is constant, which of the following is true? a) P . T = const. b) P . V = const. c) P + T = const. d) P/T = const. [4] Use: (P 1 . V 1 / T 1 ) = (P 2 . V 2 / T 2 ) apply V 1 = V 2 and see what appears to be constant or use (P . V/T) = const., join V to the constant and see what is left as constant. 2. If we increase temperature of the gas from 50 o C to 100 o C at constant pressure then its volume will a) increase twice b) increase less than twice c) decrease twice c) decrease less than twice [4] You need to express temperature in Kelvins ! 3. If we decrease volume of the ideal gas from 6 L to 3 L at a constant temperature its pressure will a) increase twice b) increase less than twice c) decrease twice c) decrease less than [4] Use: P . V = const or (P 1 . V 1 / T 1 ) = (P 2 . V 2 / T 2 ) and substitute V 1 = 6L V 2 = 3L. Find P 2 setting T 1 = T 2 4. A gas occupies volume 3 L at 300 K. What is its volume at 400 K if pressure is constant? a) 2 L b) 4 L c) 6 L d) 8 L [4] Use: (P 1 . V 1 / T 1 ) = (P 2 . V 2 / T 2 ) apply P 1 = P 2 Substitute V 1 = 3 L T 1 = 300 K T 2 = 400 K so V 2 = .. 5. 32 g of methane (CH 4 ) should occupy at STP conditions the volume closest to a) 11.2 L b) 22.4 L c) 33.6 L d) 44.8 L [4] Evaluate: 32 g of CH 4 make 32/16 mole. One mole has a volume 22.4 L so 2 moles have volume 44.8 L 6. 40 g of methane (CH 4 ) was burned in oxygen to give CO 2 and water. a) Write and balance the reaction [4] CH 4 + 2O 2 CO 2 + 2H 2 O b) Calculate the volume of CO 2 that could be obtained by burning 40 g of methane [8] Show your calculations to get full credit.

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PILOT EXAM 3 Answer Key - (Chapters5and6 1 When volume of...

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