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Thermodynamics expansion question help

In a 200cm^3 container, a certain amount of O2 is held within a piston at equilibrium with external pressure being 1 bar. The temperature of the gas is 298K. When 2J of heat is supplies, the gas expands against a constant external pressure. Assuming there is no heat lost calculate the new volume occupied after expansion.

Please help, thank you :smile:

Reply 1

username3718068

Original post by georgiamaitland

So we have an isothermal process occuring, hence change in internal energy is 0.
We conclude therefore that:

delta U = delta q - p(external) delta V
0 = q - p (external) delta V
delta V = q/p
= 2/(10^5) m^3

hence new volume = (200/10^6)m3 + (2/10^5) m3

(edited 5 years ago)