Question

Using the steam tables, determine the enthalpy change for 1lb of water:

Condensing a saturated vapor at 212 Fahrenheit and 1 atm abs.

Answer 1

change in enthalpy for 1 lb water is - 970.10872 Btu

Step-by-step explanation:

Given data:

weight of water 1 lb

pressure 1 atm

temperature 212 Fahrenheit

From steam table

initial enthalpy
`h_1 = 1150.288 Btu/lb`

final enthalpy
`h_2 = 180.18 Btu/lb`

change in enthalpy is given as

`\Delta h = m (h_2 -h_1)`

`\Delta h = 1* (  180.18020 - 1150.288)`

`\Delta h = - 970.10872 Btu`

change in enthalpy for 1 lb water is - 970.10872 Btu