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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 = atm

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.

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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