For isothermal expansion of an ideal gas into vacuum, among the following how many are zero, Pext, g, `Delta T, Delta U, Delta H, Delta S, Delta G, Delta S_("surr"), Delta S_("total")`

Answer

6

Explanation

`Delta E = Delta H = Delta T = q = p_("ext") = Delta S_("surr") = 0`
`Delta S_("sys") = Delta S_("total") + +ve, Delta G_("sys") - ve`