Estimate the speed of sound for steam directly from Eq. 16.25 and the steam tables for a

Question:

Estimate the speed of sound for steam directly from Eq. 16.25 and the steam tables for a state of 6 MPa, 400°C. Use table values at 5 and 7 MPa at the same entropy as the wanted state. Eq. 16.25 is then done by finite difference. Find also the answer for the speed of sound assuming steam is an ideal gas.