Assume that helium behaves as an ideal monatomic gas.If 2 moles of helium undergo a temperature increase of 100 K at constant pressure, how much work is done by the gas?
A)0 J
B)1700 J
C)2500 J
D)4200 J
E)5000 J

Question

Quizplus · Accepted Answer

When a gas undergoes a temperature increase at constant pressure, the amount of work done by the gas is given by the formula W = nCpΔT, where n is the number of moles of the gas, Cp is the molar heat capacity at constant pressure, and ΔT is the change in temperature. For an ideal monatomic gas, Cp = (5/2)R, where R is the gas constant. Thus, we have:

W = 2 mol * (5/2)R * 100 K = 2500 J

Therefore, the correct answer is B.

Assume That Helium Behaves as an Ideal Monatomic Gas