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Step 1: Calculate the molar mass of methane (CH₄).
The molar masses of C and H are 12 g and 1 g respectively.
[tex]\begin{aligned} \text{molar mass} & = \text{12 g + 4(1 g)} \\ & = \text{16 g} \end{aligned}[/tex]
Step 2: Calculate the number of moles of methane by using dimensional analysis.
[tex]\begin{aligned} \text{moles of} \: \text{CH}_4 & = \text{4 g} \: \text{CH}_4 \times \frac{\text{1 mol} \: \text{CH}_4}{\text{16 g} \: \text{CH}_4} \\ & = \boxed{\text{0.25 mol}} \end{aligned}[/tex]
Hence, there are 0.25 mol in 4 g of methane.
[tex]\\[/tex]
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