A helium ballon has a pressure of 120 kPa, temperature of 20°C and a volume of 0

Question

A helium ballon has a pressure of 120 kPa, temperature of 20°C and a volume of 0.05 m³. Ovee 7 days it loses helium at an average rate of 0.01 gmol/h. What is the volume after 7 days if the pressure has reduced to 102 kPa and the temperature is unchanged? A helium ballon has a pressure of 120 kPa, temperature of 20°C and a volume of 0.05 m³. Ovee 7 days it loses helium at an average rate of 0.01 gmol/h. What is the volume after 7 days if the pressure has reduced to 102 kPa and the temperature is unchanged?

Explanation / Answer

Solution:- temperature is constant and only volume and pressure are changing so it is a Boyle's law problem.

according to this law, at constant temperature, volume of gas is inversly proportional to the pressure.

P1V1 = P2V2

120 kPa x 0.05 m3 = 102 kPa x V2

V2 = (120 kPa x 0.05 m3)/102 kPa

V2 = 0.059 m3

so, the volume after 7 days would be 0.059 m3.

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