Question 439: Thermodynamics & KTG

Question

Two moles of helium gas is mixed with three moles of hydrogen molecules (taken to be rigid). What is the
molar specific heat of mixture at constant volume ? (R = 8.3 J/mol K)

Accepted Answer

$${f_{mix}} = {{{n_1}{f_1} + {n_2}{f_2}} \over {{n_1} + {n_2}}}$$
$$ \Rightarrow {{2 	imes 3 + 3 	imes 5} \over 5} = {{21} \over 5}$$
$${C_v} = {{fR} \over 5} = {{21} \over 5} 	imes {R \over 2} = 17.4$$ J/mol K

Answer

21.6 J/mol K

Answer

17.4 J/mol K

Answer

15.7 J/mol K

Answer

19.7 J/mol K

Thermodynamics & KTG

Two moles of helium gas is mixed with three moles of hydrogen molecules (taken to be rigid). What is the molar specific heat of mixture at constant volume ? (R = 8.3 J/mol K)

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