A gas mixture of 4 kg of O2, 6 kg of N2, and 8 kg of CO2

Question:

A gas mixture of 4 kg of O2, 6 kg of N2, and 8 kg of CO2 is contained at a pressure of 120 kPa and 20 8 C in a rigid container. Calculate:
i) The mass fraction of each component
ii) The mole fraction of each component
iii) The gas constant for this mixtureiv)
iv) The amount of heat needed to raise the mixture temperature from 20 8C to 100 8C