Chemistry 9701 · AS & A Level · Atoms, molecules and stoichiometry

Atoms, molecules and stoichiometry — practice question

X is an impure sample of a Group 2 metal carbonate, $\text{MCO}_3$. In X, $57\%$ by mass is $\text{MCO}_3$. The impurities present in X do not react with hydrochloric acid. $7.4\,\text{g}$ of X is treated with an excess of dilute hydrochloric acid. $0.050\,\text{mol}$ of the Group 2 metal chloride is formed. What is the identity of the Group 2 metal?

  • AMg
  • BCa
  • CSr
  • DBa

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