# Ideal Gas Law Chemistry?

1. If you have 3 moles of a gas at a pressure of 2.5 atm and a volume of 8 liters, what is the temperature?

a 0.81 K

b 57.86 K

c 81.26 K

d 25 K

2. A balloon can hold 10 liters of a gas. If I blow up this balloon with 2 moles of oxygen gas at a pressure of 0.76 atmospheres, what is the temperature of the balloon?

a 0.457 K

b 46.3 K

c 4.63 K

d 45.7 K

3. How many moles of gas does it take to occupy 520 mL at a pressure of 400 torr and a temperature of 340 K?

a 0.980 moles

b 0.0736 moles

c 0.0098 moles

d 73.6 moles

### 1 Answer

- Roger the MoleLv 711 months agoFavorite Answer
1.

T = PV / nR = ( 2.5 atm) x (8 L) / ((3 mol) x (0.082057338 L atm/K mol)) = 81.24 K

So answer c, although no more than one significant digit is justified.

2. Balloons typically do not have a constant volume, but ignoring that fact:

T = PV / nR = (0.76 atm) x (10 L) / ((2 mol) x (0.082057338 L atm/K mol)) = 46.3 K

So answer b.

3.

n = PV / RT = (400 torr) x (0.520 L) / ((62.36367 L torr/K mol) x (340 K)) = 0.0098 mol

So answer c.

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