What is the energy change when the temperature of 14.0 grams of gaseous helium is decreased from 38.0 C to 21.8 C?

Question

Answer should be in joules

Answer 1

To answer this, we need to know the specific heat for gaseous helium. Looking it up I find it to be 5.19 J/gº

q = mC∆T

q = heat energy = ?

m = mass = 14.0 g

∆T = change in temperature = 38.0 - 21.8 = 16.2 degrees

q = (14.0 g)(5.19)(16.2) = 1177 J