How many moles of ammonium ions are in 51 grams of ammonium carbonate?

Question

Moles problem

Answer 1

The formula for ammonium carbonate is (NH₄)₂CO₃

The molar mass of ammonium carbonate is 96.1 g/mole

51 g x 1 mole/96.1 g = 0.531 moles (NH₄)₂CO₃

There are TWO moles of NH₄⁺ (ammonium ions) per 1 mole of ammonium carbonate, thus ...

Moles of ammonium ions = 0.531 moles (NH₄₎₂CO₃ x 2 moles NH₄⁺/mole (NH₄)₂CO₃ = 1.1 moles NH₄⁺ ions (to 2 sig. figs.)