The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T₁ K to T₂ K is : 

\(\frac{3}{8} N_a k_B (T_2 - T_1)\)

Number of moles in 1 g He = \(\frac{1}{4}\)

Amount of heat energy required to raise its temperature from T₁K to T₂K : Q = mc\(\Delta\) T

For monoatomic gas : C_V = \(\frac{3}{2}R\)

Q = \((\frac{1}{4}) (\frac{3}{2}R) (T_2 - T_1)\)

   = \(\frac{3}{8} N_a k_B (T_2 - T_1)\)