#### 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, WEC.