Chemistry · May / June 2025 · Paper 11 · Question 12
5070The mole and the Avogadro constant
10 cm$^3$ of hydrogen gas is mixed with $x$ cm$^3$ of chlorine gas. The equation for the reaction that takes place is shown. H$_2$(g) + Cl$_2$(g) → 2HCl(g) All the hydrogen reacts. The total volume of gas at the end of the reaction is 40 cm$^3$. All measurements are at room temperature and pressure. What is the value of $x$?
- A10 cm$^3$
- B20 cm$^3$
- C30 cm$^3$
- D40 cm$^3$
As printed in the paper
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Correct answer: C. 30 cm$^3$
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