The specific heat of air at constant volume is 0.175 cal/g C. (a) By how much

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The specific heat of air at constant volume is 0.175 cal/g · °C. 

(a) By how much does the internal energy of 5.0 g of air change as it is heated from 20 °C to 400 °C? 

(b) Suppose that 5.0 g of air is adiabatically compressed so as to rise its temperature from 20 °C to 400 °C. How much work must be done on the air to compress it?

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