Air enters a coil at 75 DB, 62 grains of moisture per pound of dry air. It leaves the coil at 53 DB, 56 grains per pound of dry air. What is the change in enthalpy in Btu`s per pound of dry air?

Air enters a coil at 75 DB, 62 grains of moisture per pound of dry air. It leaves the coil at 53 DB, 56 grains per pound of dry air. What is the change in enthalpy in Btu`s per pound of dry air?