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On 8.31, the solution states that the molar heat capacity of a monatomic ideal gas at constant pressure is = 5/2 R and later states that the molar heat capacity of a monatomic ideal gas at constant volume is = 3/2 R. What does this mean and how can you find it?
The general equation that you're going to use is nC(delta)T or mC(delta)T. Now, C can either be Cp, which is constant pressure or Cv, which is constant volume. When you have Cp, you would use 5/2 R. When you have Cv, you would use 3/2 R. The R will be the gas constant, so you have to look at the units to find out which gas constant to use.
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