EasyChemistryHigh School (9–10)GeneralAtoms and Molecules › Laws of Chemical CombinationNumerical

The atomic mass of sulphur is 32 u, and 1 u = 1.66 × 10⁻²⁴ g.

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

The atomic mass of sulphur is $32\ \text{u}$ , and $1\ \text{u} = 1.66 \times 10^{-24}\ \text{g}$ .

Find the mass of one atom of sulphur in grams.
About how many sulphur atoms are there in $1\ \text{g}$ of sulphur?

Need a reminder? The key ideaShow

Dalton: matter is made of atoms, which are not created or destroyed in a reaction; atoms of one element are alike; they join in small whole-number ratios. An atom is about $0.1\ \text{nm}$ in radius, and $1\ \text{u} = 1.66 \times 10^{-24}\ \text{g}$ .

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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