Question

What is the internal energy of 7.00 mol of n2 gas at 40c?

a) 18,200j
b) 5820j
c) 45,500j
d) 11,600j

Answer 1

To find the internal energy of gas we can use

`U = (f)/(2)nRT`

here given that

Number of moles (n) = 7 moles

Temperature T = 40 + 273 = 313 K

degree of freedom(f) = 5 (for diatomic gas)

now by above formula

`U = (5)/(2)* 7 * 8.31 * 313`

`U = 45518.03 J`

So it is approximately 45500 J (option C)