The number of moles (n) is given by the formula n = mass/molar mass.
For $\mathrm{CH}_{4}$, the molar mass is 16 g/mol. So, the number of moles of $\mathrm{CH}_{4}$ is:
\[n_{CH_{4}} = \frac{8.0 \, \mathrm{g}}{16 \, \mathrm{g/mol}} = 0.5 \, \mathrm{mol}\]
For
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