When a monatomic gas expands at constant pressure, the percentages of heat supplied that is used to do external work and to increase its internal energy are respectively

Step-by-step solution

For mono atomic, n =3 C _ p = 5 2 R , C _ v = 3 2 R Total heat supplied to system, Q = nC _ p T = 5 nR T 2 Heat needed to increase the internal energy, U = nC _ v T = 3 2 nR T Percentage heat to increase its internal ene: gy = U Q 100= 3 2 nR T 5 2 nR T 100=60 % Heat required for expansion, W = P V = nR T Percentage heat to do external work = W Q 100= nR T 5 2 nR T 100=40 %