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Chemistry · May / June 2024 · Paper 11 · Question 10

5070The mole and the Avogadro constant

The reactions shown all produce hydrogen. Which reaction produces the greatest volume of hydrogen, measured at room temperature and pressure?

  1. A1.4 g carbon reacts with excess steam. $C(s) + H_2O(g) \rightarrow H_2(g) + CO(g)$
  2. B2.4 g calcium hydride, $CaH_2$, reacts with excess water. $CaH_2(s) + 2H_2O(l) \rightarrow Ca(OH)_2(aq) + 2H_2(g)$
  3. C4.0 g calcium reacts with excess dilute hydrochloric acid. $Ca(s) + 2HCl(aq) \rightarrow CaCl_2(aq) + H_2(g)$
  4. D50 cm$^3$ of 2.0 mol / dm$^3$ sulfuric acid reacts with excess zinc. $Zn(s) + H_2SO_4(aq) \rightarrow ZnSO_4(aq) + H_2(g)$

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Correct answer: A. 1.4 g carbon reacts with excess steam. $C(s) + H_2O(g) \rightarrow H_2(g) + CO(g)$

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