What is the internal energy of 1.75 kg of helium with a temperature of 100 degrees C?

Question

Atomic mass=4.00260 u

Answer 1

nomber of moles
1.75kg= 1750g
so n =1750/4.0026=437.2moles
As he lium is a monotomic gas it has only 3 degrees of liberty

Internal energy E = 3/2*n*R*T T=273+100=373K

E= 3/2*437.2*8.31*373=2.033*10^6 J