The fuel used in many disposable lighters is liquid butane, C4H10. How many carbon atoms are in 3.00 g of butane?
You can extend the analysis to samples of a given mass using the molar mass of a compound, which is the mass of a mole of the compound. The molar mass of N2 is 28.01 g/mol. Therefore you can say that a mole of N2 has a mass of 28.01 g and contains 6.022×1023 molecules of the gas.
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