### How many moles of ammonium ions are in 8.903 g of ammonium carbonate?

The most common form of solid ammonium carbonate is a hydrate with formula (NH4)2CO3.H2O and a gram formula unit mass of 114.10. The formula shows that each formula unit contains 2 ammonium ions. The number of formula units of ammonium carbonate is 8.903/114.10 or 0.078028. The number of formula units of ammonium ions is twice this, or 0.1561, to the justified number of significant digits.

### What is ammonia bicarbonate?

Ammonia bicarbonate is nothing at all (nor is ammonia carbonate). Ammonium bicarbonate is a real chemical, and it has formula NH4HCO3 (the combination of ammonium ion (NH4+) and the bicarbonate ion (HCO3-). Ammonium carbonate is a similar chemical with formula (NH4)2CO3, and is the combination of 2 NH4+ ions with one carbonate ion (CO32-).

### How many moles of nitrogen are in 650 moles of ammonium carbonate How many grams of this compound supply this much nitrogen?

The formula unit for the usual form of solid ammonium carbonate is (NH4)2CO3.H2O. This formula shows that each formula unit contains two atoms of nitrogen. Because nitrogen forms diatomic molecules at standard temperature and pressure, the number of moles of nitrogen is therefore the same as the number of formula units of ammonium carbonate, stated to be 650. The gram formula unit mass of this solid ammonium carbonate is 114.10. Therefore, 114.10(650) or 7.42 X…