Recent content by kido

Ah, I see. I really must learn which expressions apply only to ideal gases! So because this question mentions the standard enthalpy of vaporization, the external pressure is at standard conditions, which is 1atm? Thank you very much for your help.

Okay, i understand that now, thanks. There's one more thing that i am having trouble understanding, though. In the solutions, it says that because the condensation is done isothermally and reversibly, the external pressure is constant at 1atm. I thought the whole point of a reversible process...

okay, so what are the expressions for deltaU and deltaH for a liquid?

Homework Statement A sample of 1.00 mol H20(g) is condensed isothermally and reversibly to liquid water at 100°C. The standard enthalpy of vaporization of water at 100°C is 40.656 kJ mol-1. Find w, q, change in internal energy, and change in enthalpy for this process. Homework Equations...

Homework Statement State whether the thermodynamic quantities q (heat), w (work), ΔU (internal energy) and ΔS (entropy) are greater than, equal to, or less than zero when one mole of an ideal gas expands irreversibly and against a constant external pressure of zero. Homework Equations...