Question

calculate the molar mass of ammonium carbonate.
a 96.09 g/mol
b 112.09 g/mol
c 88.05 g/mol
d 78.05 g/mol

Explanation:

Step1: Determine the formula of ammonium carbonate

The formula of ammonium carbonate is \((NH_4)_2CO_3\).

Step2: Calculate the molar mass of each element in the formula

• The molar mass of \(N\) is \(14.01\ g/mol\), and there are \(2\) \(N\) atoms in \((NH_4)_2\), so the total mass for \(N\) is \(2\times14.01 = 28.02\ g/mol\).
• The molar mass of \(H\) is \(1.008\ g/mol\), and there are \(8\) \(H\) atoms (\(4\times2\)), so the total mass for \(H\) is \(8\times1.008=8.064\ g/mol\).
• The molar mass of \(C\) is \(12.01\ g/mol\), and there is \(1\) \(C\) atom, so the mass for \(C\) is \(12.01\ g/mol\).
• The molar mass of \(O\) is \(16.00\ g/mol\), and there are \(3\) \(O\) atoms, so the total mass for \(O\) is \(3\times16.00 = 48.00\ g/mol\).

Step3: Sum up the molar masses of all elements

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Answer:

A. \(96.09\ g/mol\)