Three moles of an ideal gas with a molar heat capacity at constant volume of 4.9 cal/(mol?K) and a molar heat capacity at constant pressure of 6.9 cal/(mol?K) starts at 300 K and is heated at constant pressure to 320 K,
then cooled at constant volume to its original temperature. How much heat flows into the gas during this two-step process?
A)
710 cal
B)
-720 cal
C)
0 cal
D)
120 cal
E)
-120 cal
D
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