Problem 1
Problem 2

Thermodynamics Concept Tests

Problem 1

A piston is connected to a drive train that causes a car to move. The flame below is turned on, which heats up the gas causing it to expand.

The signs of q and w for the gas in the cylinder are:

A.     q +     w +
B.     q +     w -
C.     q -      w +
D.     q -      w -

Problem 2

Consider burning acetylene:

C₂H₂(g) + 3/2O₂(g) <---> CO₂ (g) + H₂O(l)         DH = -1301.1 kJ

What is DH for the reaction:

2CO₂(g) + 2H₂O(l) <---> 2C₂H₂(g) + 3O₂(g)

A.  DH = -2602.2 kJ
B.  DH = -1301.1 kJ
C.  DH = 1301.1 kJ
D.  DH = 2602.2 kJ