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
Answer: A ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.