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A sample of air weighing 1.18 g occupies...

A sample of air weighing `1.18 g` occupies `1.0 xx 10^(3) cm^(3)` when kept at `300 K and 1.0 xx 10^(5)` pa. When `2.0 cal` of heat is added to it constant volume, its temperature increases by `1^@C`. Calculate the amount if heat needed to increases the temperature of air by `1^@C` at constant pressure if the mechanical equivalent of heat si `4.2 xx 10^(-1)` . Assume that air behaves as an ideal gas.

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