# CH 301 CH5 answers - Chapter 5 answers At 25oC a sample of...

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Chapter 5 answers At 25 o C a sample of He has a volume of 4.00 x 10 2 mL under a pressure of 7.60 x 10 2 torr. What volume would it occupy under a pressure of 2.00 atm at the same T? () () mL 10 00 . 2 torr 1520 mL 400 torr 760 P V P V V P V P 2 2 1 1 2 2 2 1 1 × = = = = A sample of hydrogen, H 2 , occupies 1.00 x 10 2 mL at 25.0 o C and 1.00 atm. What volume would it occupy at 50.0 o C under the same pressure? It is CRITICAL to convert ANY temperature to KELVIN!! T 1 = 25 + 273 = 298 K T 2 = 50 + 273 = 323 K mL 108 K 298 K 323 mL 10 1.00 = V T T V = V T V T V 2 2 1 2 1 2 2 2 1 1 = × × = If we have a 2.5L of a gas at 25°C and 1.5atm, and we increase the temperature by 100 °C and find the pressure is now 800 torr, what is the new volume? P 1 = 1.5atm P 2 =800torr * 1atm/760torr = 1.053atm V 1 = 2.5L V 2 = ? T 1 = 25°C=25+273.15K=298.15K T 2 = T 1 +100°C = T 1 + 100K = 398.15K Sub these in to the combined law above: 1.5atm*2.5L = 1.053atm*V 2 298.15K 398.15K V 2 = 4.76L A sample of nitrogen gas, N 2 , occupies 7.50 x 10 2 mL at 75.0 0 C under a pressure of 8.10 x 10 2 torr. What volume would it occupy at STP? () () ( () ( ) ) mL 627 K 348 torr 760 K 273 mL 750 torr 810 T P T V P = V for Solve torr 760 = P torr 810 = P K 273 = T K 348 = T ? = V mL 750 = V 1 2 2 1 1 2 2 1 2 1 2 1 = =

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A sample of methane, CH 4 , occupies 2.60 x 10 2 mL at 32 o C under a pressure of 0.500 atm.
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## This note was uploaded on 11/09/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas.

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CH 301 CH5 answers - Chapter 5 answers At 25oC a sample of...

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