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 energy has been transferred to the helium as heat?
A)1700 J
B)2500 J
C)4200 J
D)5000 J
E)6700 J

Question

Quizplus · Accepted Answer

According to the formula Q = nCpΔT, where Q is the heat transferred, n is the number of moles of gas, Cp is the specific heat capacity at constant pressure, and ΔT is the change in temperature, we can calculate the heat transferred as:

Q = 2 mol x 20.8 J/(mol K) x 100 K = 4160 J

However, we must remember to round to the appropriate number of significant figures, which in this case is 3. Therefore, the answer is 4200 J.

Assume That Helium Behaves as an Ideal Monatomic Gas