Molar MassMolar mass of ammonium chloride (NH4Cl)
The molar mass of ammonium chloride, NH4Cl, is 53.49 g/mol. One mole of it, which is 6.022 × 1023 formula units, has a mass of 53.49 grams.
53.49 g/mol
14.007 + 4 × 1.0080 + 35.45 = 53.489 · 6 atoms in the formula · also called sal ammoniac
About ammonium chloride
Ammonium chloride is a white salt that sublimes on heating, breaking into ammonia and hydrogen chloride which recombine on a cool surface. It is used in dry cells and as a flux in soldering.
Other names: sal ammoniac.
The working
The formula NH4Cl has 1 nitrogen atom, 4 hydrogen atoms and 1 chlorine atom, 6 atoms in all. Multiply each count by the atomic weight of the element and add:
| Element | Atoms | Atomic weight | Total | Share by mass |
|---|---|---|---|---|
| Nitrogen (N) | 1 | 14.007 | 14.007 | 26.19% |
| Hydrogen (H) | 4 | 1.0080 | 4.032 | 7.54% |
| Chlorine (Cl) | 1 | 35.45 | 35.450 | 66.28% |
14.007 + 4 × 1.0080 + 35.45 = 53.489 g/mol
With the rounded atomic masses used in many school books (N = 14, H = 1, Cl = 35.5) the answer is 53.5 g/mol. The difference from 53.49 is too small to matter in most school sums.
Percentage composition
By mass, NH4Cl is 26.19% nitrogen, 7.54% hydrogen and 66.28% chlorine. The largest share comes from chlorine. In a 100 g sample there are 26.2 g of nitrogen, 7.5 g of hydrogen and 66.3 g of chlorine.
Notice that hydrogen has more atoms in the formula (4) than chlorine (1), yet gives a smaller share of the mass. Percentage by mass depends on how heavy each atom is, not only on how many there are.
Worked examples
Grams to moles. How many moles are in 250 g of NH4Cl? Divide the mass by the molar mass: 250 ÷ 53.49 = 4.674 mol.
Moles to grams. What is the mass of 0.2 mol of NH4Cl? Multiply: 0.2 × 53.49 = 10.7 g.
Counting particles. 250 g contains 4.674 mol × 6.022 × 1023 = 2.815 × 1024 formula units.
Making a solution. A 0.1 mol/L solution contains 0.1 × 53.49 = 5.349 g of NH4Cl in each litre. For 250 mL, weigh 1.337 g and make it up to the mark with water.
Quick conversion tables
| Amount | Mass |
|---|---|
| 0.1 mol | 5.349 g |
| 0.5 mol | 26.74 g |
| 1 mol | 53.49 g |
| 2 mol | 107 g |
| 5 mol | 267.4 g |
| Mass | Moles |
|---|---|
| 1 g | 0.0187 mol |
| 10 g | 0.187 mol |
| 100 g | 1.87 mol |
| 1 kg | 18.7 mol |
For other amounts use the grams and moles converter.
Questions people ask
What is the molar mass of NH4Cl?
The molar mass of ammonium chloride (NH4Cl) is 53.49 g/mol, or 53.489 g/mol before rounding, using IUPAC abridged atomic weights.
How many moles are in 100 g of NH4Cl?
100 ÷ 53.49 = 1.87 mol.
What is the mass of one formula unit of NH4Cl?
Divide the molar mass by the Avogadro constant: 53.49 ÷ 6.022 × 1023 = 8.882 × 10-23 g.
What is the percentage of chlorine in NH4Cl?
Chlorine makes up 66.28% of the mass of NH4Cl: 1 × 35.45 ÷ 53.489 × 100.
Which values? This site uses the abridged standard atomic weights published by IUPAC (CIAAW), read on 12 November 2026. Your textbook or question paper may round them differently, for example H = 1 and O = 16, so its answer can differ slightly. In an exam, use the values the paper gives.