An ideal gas mixture has a volume base composition of 40% Ar and 60% Ne (monatomic gases). The mixture is now heated at constant volume from 300 K to 600 K. The amount of heat transfer is__________ in kJ/kg
(Round to nearest integer; for example if the answer is 14.6kJ/kg, write 15; if the answer is 14.49kJ/kg write 14; do not include the units in your answer)