Introduction to the First Law of Thermodynamics - Closed Systems: Example Problems

Try to solve these problems before watching the solutions in the screencasts.

Example Problem 1

Two containers at 350 K and 0.5-MPa pressure each contain 1.0 mol of an ideal gas (\(C_P\) = 31 J/mol K). Container A: constant pressure piston and cylinder Container B: fixed volume What is the temperature and pressure in each container after 8.5 kJ of heat are added to each?

Example Problem 2

One mole of an ideal gas (\(C_P\) = 30 J/mol K) in a closed piston/cylinder is compressed from 300 K, 0.1 MPa to 0.8 MPa in an isothermal pathway. Calculate ΔU, ΔH, Q, W_{EC}.