Question

Five moles of helium is mixed with two moles of hydrogen to form a mixture. Take molar mass of helium $M_1=4g$ and that of hydrogen $M_2=2g$
If the internal energy of He sample of 100J and that of the hydrogen sample is 200J, then the internal energy of the mixture is:

• A. 900J
• B. 128.5J
• C. 171.4J
• D. 300J

Answer 1

The correct option is D 300J

As internal energy is additive so total internal energy of system is 300J.