The volume of a gas at pressure $21 \times {10^4}\,N/{m^2}$ and temperature $27^o C$ is $83 $ litres. If $R = 8.3\ J/mol/K$, then the quantity of gas in $gm-mole$ will be
  • A$15$
  • B$42$
  • C$7$
  • D$14$
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