50g of an ideal gas is undergoing a process for which heat capacity is `50 cal//mole-K`. If rise in temperature during the process is `100^(@)C` then calculate work involved in process (given molar mass of gas =`10 g//"mole"`, `C_(p) of gas =5R)`
A. `-29kcal`
B. `-21kcal`
C. `29 kcal`
D. `21 kcal`
