A monatomic ideal gas in a rigid container is heated from 201 K to298 K by addin

Question

A monatomic ideal gas in a rigid container is heated from 201 K to298 K by adding 9000 J of heat. How many moles of gas are there?
I know that Ineed to use the equation for constant volume instead of constantpressure, but I keep getting stuck on rearrangement to find themoles. Any help would be greatly appreciated :)
I know that Ineed to use the equation for constant volume instead of constantpressure, but I keep getting stuck on rearrangement to find themoles. Any help would be greatly appreciated :)

Explanation / Answer

    E = n Cv T            E = 9000J , Cv = 12.5J/mol.K for monoatomic gas               T = 298-201 = 97K substitute the values to get solution

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