A sealed cubical container, with each side measuring 22.0cm, contains a gas with two times Avogadro's number of argon atoms at a temperature of 28.0°C. What is the internal energy of the gas in joules?
A) 22.0 cm
B) Avogadro's number
C) 28.0°C
D) Internal energy
Note: The unnecessary space and words have been removed.