Question

A balloon is filled to 0.5 L at STP with helium. If the balloon is placed into a vacuum refrigerator at 500 torr and -40 C, what will the new volume be?

Answer 1

$$V _ {2} = \frac {P _ {1} V _ {1} T _ {2}}{T _ {1} P _ {2}} = \frac {\frac {P _ {1} V _ {1}}{T _ {1}} = \frac {P _ {2} V _ {2}}{T _ {2}}}{2 7 3 , 1 5 \cdot 6 6 6 6 1 , 1 8 4} = 0, 6 4 L$$

500 torr = 66661,1842 Pa

-40 °C = 233,15 K

Answer: 0,64 L