The average kinetic energy per molecule of helium gas at temperature T is E and the molar gas constant is R. Then Avogadro's number is equal to :
Answer & explanation
Correct answer: option 4
Average kinetic energy per unit molecule : E = \(\frac{3}{2}kT\)
\(k = \frac{2E}{3T}\)
But, avogadro's Number = NA = \(\frac{R}{k} = \frac{R}{2E/3T}\)
NA = \(\frac{3RT}{2E}\)