How can I calculate the percentage by mass of sodium in sodium azide, NaN3(s); used in automobile air bags?

1 Answer
Anthony F. · Media Owl
Jun 12, 2014

The percentage of sodium in this compound is the molar mass of sodium divided by the molar mass of sodium azide.

The molar mass (atomic weight ) of sodium is 23.0 grams/mole and the molar mass of sodium azide, #NaN_3#, is the mass of sodium, 23.0 gram/mole added to the molar mass of three atoms of nitrogen (14.0 x 3 = 42 gram/mole) which equals 65.0 grams/mole.

The percentage of sodium is 23.0 /65.0 x 100 % = 35 %.

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