Question:
A balloon has 5.0 g mole of helium at 7oC. Calculate
(a) the number of atoms of helium in the balloon
(b) the total internal energy of the system
Solution:
Average KE per molecule = 3/2kT
No.of moles of helium, n = 5 g mole
T = 280 K
(a) No.of atoms of helium in the balloon = 30.015 × 1023
(b) KE = 3/2 kbT
Total internal energy = 1.7 × 104J