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3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

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Question 31

The equation for the reaction between sodium hydroxide and sulfuric acid is shown.

NaOH+H2SO4→Na2SO4+H2O\text{NaOH} + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}NaOH+H2​SO4​→Na2​SO4​+H2​O

The equation is not balanced.

ElementH\text{H}HO\text{O}ONa\text{Na}NaS\text{S}S
Relative atomic mass (ArA_rAr​)1162332
a.

Calculate the relative formula mass (MrM_rMr​) of sulfuric acid, H2SO4\text{H}_2\text{SO}_4H2​SO4​.

[2]
b.

Give the balanced equation.

Calculate the total relative formula mass of the reactants and the total relative formula mass of the products in the balanced equation.

Explain how your calculated values support the law of conservation of mass.

[4]
Markscheme

3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations Questions

  1. GCSE
  2. /Chemistry
  3. /3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

95 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.

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