1. The problem statement, all variables and given/known data How do we obtain: w = q - Δh 2. Relevant equations 3. The attempt at a solution If you neglect the second half of the SFEE and simplify we get: What is the next step from the last line in the above image to w = q - Δh I mean dw/dt = dq/dt - Δh so if we multiply by dt we get: dw = dq - Δh(dt) w = q - Then I assume this should be integrated? If yes, how? Can't seem to get my head round it. Also, what is the difference between w = q - Δh and w = q - Δu? I know u is specific internal energy and h is specific enthalpy but the above seems to suggest they're the same?