If a mixture of $28\,\, g$ of Nitrogen, $4 \,\,g$ of Hydrogen and $8 \,\,gm$ of Helium is contained in a vessel at temperature $400 \,\,K$ and pressure $8.3 \times 10^5 \,\,Pa$, the density of the mixture will be :
  • A$3\,\, kg/m^3$
  • B$0.2\,\, kg/m^3$
  • C$2\,\, g/litre$
  • D$1.5 \,\,g/litre$
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