physics

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A monoatomic ideal gas has Cp= 5R/2

a) four moles of the gas undergoes a process in which the temperature of the gas increases from 300 K to 500 K while the pressure is kept constant at 2.00 x 105 Pa. What is the change in the internal energy of the gas?

b) Four moles of the gas undergoes a process for which the volume is 3.00 m3 and is kept constant while the pressure decreases from 4500 Pa to 3600 Pa. What is the heat flow Q for this process?

please explain :)
Thanks!!

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