Five moles of helium are mixed with two moles of hydrogen to form a mixture. Take molar mass of helium $M_1=4\ g$ and that of hydrogen $M_2=2\ g$ If the internal energy of He sample of $100\,\,J$ and that of the hydrogen sample is $200\,\,J$, then the internal energy of the mixture is ..... $J$
  • A$900$
  • B$128.5$
  • C$171.4$
  • D$300 $
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