How many moles of ammonium nitrate are present in "8.047 g" of this substance?

1 Answer
Stefan V.
Mar 29, 2015

That much ammonium nitrate contains "0.1005 moles".

When you are asked to convert either grams to moles, or moles to grams, always think molar mass.

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A compound's molar mass represents the weight of 1 mole of that respective compound. You can either look up the molar mass of ammonium nitrate, NH_4NO_3, or add the molar masses of the atoms that comprise it.

Since ammonium nitrate's molar mass represents the mass of 1 mole, you can use it to determine how many moles you correspond to that many grams

"molar mass" = "m"/"n" => "n" = "m"/"molar mass"

In your case, ammonium nitrate's molar mass is 80.052 g/mol, which means that

n = ("8.047"cancel("g"))/("80.052"cancel("g")/"mol") = "0.1005 moles" NH_4NO_3

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