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Amount of substance

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Question 33

Which statement gives the numerical value of the Avogadro constant?

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

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​.

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

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.

Amount of substance Questions

  1. A Level
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