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2.6 Calculations involving masses

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Question 6

A technician measures 150 cm3 of dilute hydrochloric acid for a reaction. The concentration of hydrogen chloride in the acid is 14.6 g dm−314.6\,\mathrm{g\,dm^{-3}}14.6gdm−3.

Ca(OH)2+2HCl→CaCl2+2H2O\mathrm{Ca(OH)_2 + 2HCl \rightarrow CaCl_2 + 2H_2O}Ca(OH)2​+2HCl→CaCl2​+2H2​O

Relative atomic masses: H=1\mathrm{H}=1H=1, O=16\mathrm{O}=16O=16, Cl=35.5\mathrm{Cl}=35.5Cl=35.5, Ca=40\mathrm{Ca}=40Ca=40.

What mass of calcium hydroxide reacts exactly with the measured acid?

[1]
A

2.19 g2.19\,\mathrm{g}2.19g

B

4.44 g4.44\,\mathrm{g}4.44g

C

2.22 g2.22\,\mathrm{g}2.22g

D

1.11 g1.11\,\mathrm{g}1.11g

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2.6 Calculations involving masses Questions

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

142 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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