Question

1. A balloon is filled with He gas to a volume of 2.10 L at 35 °C. The balloon is placed in liquid nitrogen until its temperature reaches –196 °C. Assuming the pressure remains constant, what is the volume of the cooled balloon?
Show all work please.
2. Gaseous chlorine is held in two separate containers at identical temperature and pressure. The volume of container 1 is 1.30 L, and it contains 6.70 mol of the gas. The volume of container 2 is 2.33 L. How many moles of the gas are in container 2?
Show all work please.

Answer 1

1. You would have to use Charles' Law, which is (V1/T1) = (V2/T2) with temperature in Kelvin
(2.10L/308K) = (V2/77K)
V2= (2.10L/308K)77K
V2= .525L

2. Avogadro's Law states (V1/n1) = (V2/n2)
(1.30L/6.70mol) = (2.33L/n2)
n2= 2.33L/(1.30L/6.70mol)
n2= 12.0mol