Question

1) A given volume of helium gas is heated by 20°C at constant external pressure. Its volume will​

Answer 1

Explanation:

V1 = Initial volume

V2 = Final volume

T1 = Initial temperature ( in K)

T2 = Final temperature (in K)

Assuming Helium is an ideal gas:

V2/V1 = T2/T1

V2 = V1*T2/T1

T2 = T1+20

So:

V2 = V1*(T1+20)/T1 =V1*(1+20/T1)

For example: if T1 = 300 K ( 27 C):

V2 =V1*(1+20/300) = 1.07*V1