Question

If you have 38 grams of CH4 how many moles of CH4 do you have
0.42 moles
2.3 moles
609.6 moles
38 moles

Answer 1

2.3 moles of $C H_{4}$

Option B

Explanation:

Mole is the standard unit used to express the amount of a chemical compounds. To find the number of moles of any chemical compound, divide the mass by the molar mass of that chemical compound. The equation is given by,

                $Number\ of\ moles =\frac{\text { mass }}{\text { Molar mass }}$

Given data:

Mass of methane = 38 grams

we know, the molar mass of methane = 16.04 g/mole

$Number\ of\ moles\ of\ \mathrm{CH}_{4}=\frac{\text { mass of } \mathrm{CH}_{4}}{\text { Molar mass of } \mathrm{CH}_{4}}$

$Number\ of\ moles\ of\ \mathrm{CH}_{4}=\frac{38}{16.04}=2.369\ moles\ of\ \mathrm{CH}_{4}$