In an isobaric process, the ratio of heat supplied to the system (dQ) and work done by the system (dW) for diatomic gas is

heat supplied to the system in an isobaric process ; dq = nC_pdT =$\frac{7\mathrm{nRT}}{2}$

work done by the system in isobaric process dw = nRT

ratio = $\frac{7\mathrm{nRT}}{2\mathrm{nRT}}$=$\frac{7}{2}$