A rigid container holds 0.650 of hydrogen gas. How much heat is needed to change the temperature of the gas from 50 K to 100 K?(adsbygoogle = window.adsbygoogle || []).push({});

All right I know this is easy but for some reason I can't get the right answer what i have been doing is using the equation Q=nC_v(T_f-T_i)

Hydrogen gas is 1 g/mol

so n= .65 mol

C_v= 5/2 R= 20.775

because hydrogen gas is diatomic?

(T_f-T_i)= 100-50= 50

so putting it all together I get 675.188

which is wrong I made Hydrogen monotomic for the hay of it and got 405 J which is wrong too.

Please tell me what I am doing wrong......

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# Heat needed to change temperature of hydrogen gas

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