What is the mass of one atom of lithium, Li\text{Li}Li?
Relative atomic mass (ArA_{\text{r}}Ar): Li=6.9\text{Li} = 6.9Li=6.9
The Avogadro constant is 6.02 × 1023 mol-1.
1.15×10−23 g1.15 \times 10^{-23} \text{ g}1.15×10−23 g
8.72×10−25 g8.72 \times 10^{-25} \text{ g}8.72×10−25 g
4.15×1024 g4.15 \times 10^{24} \text{ g}4.15×1024 g
1.15×10−24 g1.15 \times 10^{-24} \text{ g}1.15×10−24 g
91 exam-style questions on OCR GCSE Chemistry Monitoring chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.