Question 429: Thermodynamics & KTG

Question

Consider a mixture of n moles of helium gas
and 2n moles of oxygen gas (molecules taken
to be rigid) as an ideal gas. Its CP/CV value
will be :

Accepted Answer

$${{{C_P}} \over {{C_V}}} = {{{n_1}{C_{{P_1}}} + {n_2}{C_{{P_2}}}} \over {{n_1}{C_{{V_1}}} + {n_2}{C_{{V_2}}}}}$$
= $${{n 	imes {{5R} \over 2} + 2n 	imes {{7R} \over 2}} \over {n 	imes {{3R} \over 2} + 2n 	imes {{5R} \over 2}}}$$
= $${{5 + 14} \over {3 + 10}}$$
= $${{19} \over {13}}$$

Answer

23/15

Answer

67/45

Answer

40/27

Answer

19/13

Thermodynamics & KTG

Consider a mixture of n moles of helium gas and 2n moles of oxygen gas (molecules taken to be rigid) as an ideal gas. Its CP/CV value will be :

Choose the correct answer: