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
- Roger the MoleLv 79 months agoFavorite Answer
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.
n = PV / RT = (400 torr) x (0.520 L) / ((62.36367 L torr/K mol) x (340 K)) = 0.0098 mol
So answer c.