\textbf{235 –} If in a fuel cell, hydrogen is used instead of the more expensive and more dangerous methane, to pass the same number of electrons from the circuit as consuming one mole of hydrogen, how many grams of methane must be consumed?
$$(\text{C} = 12,\ \text{H} = 1\ \text{: g.mol}^{-1})$$
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(1) $4$ \hspace{1cm} (2) $8$ \hspace{1cm} (3) $16$ \hspace{1cm} (4) $32$
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