In order to find the amount of substances, it is necessary to divide the masses of these substances by their molar masses.
The amount of substance in the iron sample:
M Fe = 56 grams / mol;
N Fe = 168/56 = 3 mol;
The amount of substance in the sample of methane:
M CH4 = 12 + 4 = 16 grams / mol;
N CH4 = 160/16 = 10 mol;
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