In an isothermal reversible expansion, if the volume of $96\, gm$ of oxygen at $27°C$ is increased from $70$ litres to $140$ litres, then the work done by the gas will be
  • A$300\,R\,{\log _{10}}\,2$
  • B$81\,R\,{\log _e}\,2$
  • C$900\,R\,{\log _{10}}\,2$
  • D$2.3 \times 900\,R\,{\log _{10}}\,2$
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