Five moles of helium are mixed with two moles of hydrogen to form a mixture. Take molar mass of helium $M_1 = 4 \ g/mol$ and that of hydrogen $M_2 = 2 \ g/mol$. The equivalent molar mass of the mixture is:
- A$6 \ g/mol$
- B$\frac{24}{7} \ g/mol$
- C$\frac{18}{7} \ g/mol$
- DNone of these
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