Question

A balloon filled with helium gas occupies 2.50 L at 25°C and 1.00 atm. When released, it rises to an altitude where the temperature is 20°C and the pressure is only 0.50 atm.

Calculate the new volume of the balloon.

Answer 1

4 L

Step-by-step explanation:

using general gas equation formula (in blue pen in attached image),

P1 = 1 atm

V1 = 2.5 L

T1 = 25°C

P2 = 0.5 atm

V2 = x

T2 = 20°C

making V2 subject of the formula (in red pen in attached image),

V2 = 1*2.5*20/25*0.5

= 50/12.5

= 4 L

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