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# Anyone know the answer to this Chemistry question?

Which gas law would you use for the following problem:

What pressure is required to hold 8.0 moles of oxygen gas in an 8.0 L container at a temperature of 80 degrees Celsius?

Boyle’s Law

Charles’ Law

Combined Gas Law

Ideal Gas Law

### 2 Answers

- pisgahchemistLv 78 months agoFavorite Answer
Question on gases ....

P = ?

n = 8.0 mol

V = 8.0L

T = 80C

The clues are (1) there is no change in the P, V or T, so that eliminates the combined gas law or any of its precursors. (2) the fact that moles are included along with P, V and T tell us it must be the ideal gas equation.

PV = nRT

P = nRT / V

P = 8.0 mol x 0.08206 Latm/molK x 353K / 8.0L

P = 29 atm ............ to two significant digits

Your choice of R will determine the units of P

R = 0.08206 Latm/molK ........ atm

R = 8.314 LkPa/molK ............ kPa

R = 0.08314 Lbar/molK ......... bar

R = 62.36 Ltorr/molK ............. torr (aka mm Hg)

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