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2.6 Calculations involving masses

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Question 22
H

A conical flask containing excess dilute hydrochloric acid has a mass of 150.00 g on a balance. A student adds 0.48 g of magnesium ribbon and leaves the flask open until the reaction stops. Assume no water evaporates.

Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g)\mathrm{Mg(s) + 2HCl(aq) \rightarrow MgCl_{2}(aq) + H_{2}(g)}Mg(s)+2HCl(aq)→MgCl2​(aq)+H2​(g)

Relative atomic masses: H=1\mathrm{H} = 1H=1, Mg=24\mathrm{Mg} = 24Mg=24.

What is the final reading on the balance?

[1]
A

150.44 g150.44\,\mathrm{g}150.44g

B

150.46 g150.46\,\mathrm{g}150.46g

C

150.48 g150.48\,\mathrm{g}150.48g

D

149.96 g149.96\,\mathrm{g}149.96g

Markscheme

2.6 Calculations involving masses Questions

  1. GCSE
  2. /Chemistry
  3. /2.6 Calculations involving masses

55 exam-style questions on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one has a worked solution and a mark scheme showing where the marks go.

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