Calculate the final pressure, in atmospheres, for each of the following, if V an
ID: 1040602 • Letter: C
Question
Calculate the final pressure, in atmospheres, for each of the following, if V and n do not change.
Part A
A gas with an initial pressure of 1.20 atm at 79 ?C is cooled to -12 ?C.
Express your answer to three significant figures and include the appropriate units.
Part B
A sample of N2 with an initial pressure of 780. mmHg at -69 ?C is heated to 23 ?C.
Express your answer to three significant figures and include the appropriate units.
atm
?
Calculate the final pressure, in atmospheres, for each of the following, if V and n do not change.
Part A
A gas with an initial pressure of 1.20 atm at 79 ?C is cooled to -12 ?C.
Express your answer to three significant figures and include the appropriate units.
P = atmPart B
A sample of N2 with an initial pressure of 780. mmHg at -69 ?C is heated to 23 ?C.
Express your answer to three significant figures and include the appropriate units.
P =atm
?
Explanation / Answer
for ideal gas PV = nRT (given here V and n are constant so,)
P1/P2 = T1/T2
Part A.) P1 = 1.20atm, T1= 79 C = 352K, T2= -12C = 273 -12 = 261K
So, P2 = 1.20 x 261/352 = 0.890atm
Part B.) P1 = 780mmhg = 1.026 atm, T1= -69 C = 204K, T2= 23C = 296K
So, P2 = 1.026 x 296/204 = 1.49 atm
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