Avogadro's constant has a value of 6.02 × 1023.
How many hydrogen atoms are in 0.75 moles of hydrogen molecules (H2\text{H}_2H2)?
4.515×10234.515 \times 10^{23}4.515×1023
9.030×10239.030 \times 10^{23}9.030×1023
1.806×10241.806 \times 10^{24}1.806×1024
6.020×10236.020 \times 10^{23}6.020×1023
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.