Magnesium carbonate thermally decomposes to make magnesium oxide and carbon dioxide according to the following equation:
MgCO3→MgO+CO2 \text{MgCO}_3 \rightarrow \text{MgO} + \text{CO}_2 MgCO3→MgO+CO2Calculate the mass of magnesium carbonate needed to make 135 g of magnesium oxide. (ArA_rAr: Mg=24.3\text{Mg} = 24.3Mg=24.3, C=12.0\text{C} = 12.0C=12.0, O=16.0\text{O} = 16.0O=16.0)
Give your answer to 3 significant figures.
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.