O-LevelChemistryStoichiometry5070/11 · May/June 2025 · Q121 Mark
10 cm³ of hydrogen gas is mixed with x cm³ of chlorine gas. The equation for the reaction that takes place is shown. H2(g) + Cl2(g) → 2HCl(g) All the hydrogen reacts. The total volume of gas at the end of the reaction is 40 cm³. All measurements are at room temperature and pressure. What is the value of x?
A10 cm³
B20 cm³
C30 cm³
D40 cm³
✓ Correct answer
C: 30 cm³
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