The entropy of mixing of 10 moles of 10 moles of helium and 10 moles of oxygen at constant temperature and pressure, assuming both to be ideal gas, is:
(a)$115.3 \mathrm{JK}^{-1}$
(b)$5.8 \mathrm{Jk}^{-1}$
(c)$382.9 \mathrm{JK}^{-1}$
(d)$230.6 \mathrm{JK}^{-1}$
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.