# Chemistry question?

Calculate the final temperature, in degrees Celsius, for each of the following, if n and V are constant.

1. A sample of xenon gas at 31 ∘C and 780. mmHg is cooled to give a pressure of 590. mmHg .

2. A tank of argon gas with a pressure of 0.905 atm at -18 ∘C is heated to give a pressure of 1370 torr

### 1 Answer

- pisgahchemistLv 75 years agoFavorite Answer
Combined gas law problems.....

P1V1/T1 = P2V2/T2 .... combined gas law for a fixed quantity of gas.

1. If V is constant, then it reverts to Boyle's law. T must be in Kelvins.

P1/T1 = P2/T2

T2 = P2T1 / P1

T2 = 590. mmHg x 304K / 780. mmHg

T2 = 230.K .... -43.1C ......... to three significant digits

2. Also Boyle's law. Both pressures can be in either atm or torr.

P1/T1 = P2/T2

T2 = P2T1 / P1

T2 = 1370 torr x 255K / 688 torr

T2 = 508K ..... 235C ........ to three significant digits

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