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Question

Two moles of helium (He) are mixed with four moles of hydrogen (H2). The molar heat capacity of the mixture at constant pressure is

A
19R6
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B
17R6
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C
15R6
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D
3R2
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Solution

The correct option is A 19R6
Given,
No. of moles of helium (He)=2
No. of moles of hydrogen (H2)=4
Since, hydrogen is diatomic and helium is monoatomic.
Therefore,
(CP)H2=7R2;(CP)He=5R2
We know that,
(CP)mixture=n1CP1+n2CP2n1+n2
=2(5R2)+4(7R2)2+4
=19R6

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