Assertion :- The heat absorbed during the isothermal expansion of an i

1.	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» 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?

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»

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?