A helium balloon containing of gas at and 100 kPa was released into the atmosphere
CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A helium balloon containing 6 dm3 of gas at 27∘C and 100 kPa was released into the atmosphere. As it rose, the temperature and pressure both decreased. Assuming the balloon did not burst, and its volume stayed the same, what was the pressure inside the balloon when the temperature in the atmosphere had fallen by 30∘C ?
(1) 60 kPa
(2) 70 kPa
(3) 90 kPa
(4) 95 kPa