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One gram-mole of an ideal gas A with the...

One gram-mole of an ideal gas A with the ratio of constant pressure and constant volume specific heats. `gamma_A=5//3` is mixed with n gram-moles of another ideal gas B with `gamma_B=7//5`. If the `gamma` for the mixture is `19//13` what will be the value of n?

A

0.75

B

2

C

1

D

3

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