Question

Assertion :- The heat absorbed during the isothermal expansion of an ideal gas against vacuum is zero

reason :- The volume occupied by the molecules of an ideal gas is zero.

Answer says both the statements are correct but reason doesn't explain the assertion.

i get the Assertion part (as ∆U = 0 , so q=P∆V and in vacuum P = 0) but how come the reason is true?

Answer 1

The heat absorbed during the isothermal expansionn of an ideal gas against vacuum is zero. This is because there are no forces of attraction between the gas molecules. The volume occupied by the molecules of an ideal gas is zero. For an ideal gas, they are point molecules.


it means that both statements are correct.But reason is not the correct explanation of assertion.

Hope you understand.