Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

Sodium hydrogencarbonate is one of the ingredients in baking powder. If sodium hydrogencarbonate is heated, it produces three substances. $\text{2NaHCO}_3 \rightarrow \text{Na}_2\text{CO}_3 + \text{H}_2\text{O} + \text{CO}_2$
(a)[1]

State the type of reaction occurring when sodium hydrogencarbonate reacts in this way.

(b)[4]

Calculate the volume of carbon dioxide produced at room temperature and pressure when 12.6 g of $\text{NaHCO}_3$ is heated by following these steps: • work out the mass of one mole of $\text{NaHCO}_3$ • work out how many moles of $\text{NaHCO}_3$ are used • work out how many moles of carbon dioxide are produced • work out the volume of carbon dioxide produced at room temperature and pressure.

(c)[2]

State the formula of: • calcium hydroxide • the white precipitate that is made when limewater turns milky.

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: a (thermal) decomposition reaction

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