The molar specific heat of a monoatomic gas at constant pressure is (Universal gas constant $=8.3 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$ )

• A

  $24.9 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$
• Correct answer
  B

  $20.75 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$
• C

  $41.5 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$
• D

  $16.6 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$

Hence, the correct answer is option: 'B'.