Molar specific heat of oxygen at constant pressure CP=7.2 cal/mol°C  and  R=8.3 joule/mol/K. At constant volume, 5 mol of oxygen is heated from 10°C to 20°C, the quantity of heat required is approximately

1.  25 cal                               

2.  50 cal

3.  250 cal                             

4.  500 cal

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