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 $
Medium
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D$300 $
d Internal energy $\quad H e=100 J$
Internal energy $\quad H=200 J$
while mixing, they don't interact Internal energy of $\operatorname{mix}(100+200) J=300 J$
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