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Atoms and reactions

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Question 42

Which statement gives the numerical value of the Avogadro constant?

A

The number of helium atoms in 8.0 g8.0\text{ g}8.0 g of helium gas, He\text{He}He.

B

The number of sulfate ions in 49.0 g49.0\text{ g}49.0 g of sulfuric acid, H2SO4\text{H}_2\text{SO}_4H2​SO4​.

C

The number of chloride ions in 55.5 g55.5\text{ g}55.5 g of calcium chloride, CaCl2\text{CaCl}_2CaCl2​.

D

The number of electrons lost by 48.6 g48.6\text{ g}48.6 g of magnesium when it reacts to form Mg2+\text{Mg}^{2+}Mg2+ ions.

Markscheme

Atoms and reactions Questions

  1. A Level
  2. /Chemistry
  3. /Atoms and reactions

199 exam-style questions on OCR A A Level Chemistry Atoms and reactions, covering Atomic structure and isotopes, Compounds, formulae and equations, Amount of substance, Acids, and Redox. Each one has a worked solution and a mark scheme showing where the marks go.

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