1.

Five moles of hydrogen gas are heated from `30^(@)C` to `60^(@)C` at constant pressure. Heat given to the gas is (given `R = 2 cal//mol` degrees)A. `750 cal`B. `630 cal`C. `1050 cal`D. `1470 cal`

Answer» Correct Answer - C
c. `(Delta Q)_(P) = mu C_(P) Delta T = mu ((gamma)/(gamma - 1)) R Delta T`
`:. (Delta Q)_(P) = 5 xx (((7)/(5))/((7)/(5) - 1)) xx 2 xx 30`
`= 5 xx 2 xx (7)/(5) xx (5)/(2) xx 30 = 1050 cal`
(as `mu = 5` mol and `gamma = 7//5` for `H_(2))`


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