IB Chemistry SL 1.5.3 Molar Volume Questions

Relate equal gas volumes at the same temperature and pressure to equal amounts, then use balanced-equation volume ratios and molar volume at STP/SATP.

Exam points

Convert between gas amount and volume using the molar volume stated for the temperature and pressure conditions.
Compare gas pressure, volume and temperature using absolute-temperature and fixed-mass relationships.
Interpret pressure–volume or volume–temperature graphs for a fixed mass of gas and identify the quantities held constant.

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Study 1.5.3—Molar volume conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Chlorine undergoes many reactions.

2.67 g of manganese(IV) oxide was added to $200.0 \mathrm{~cm}^{3}$ of $2.00 \mathrm{moldm} \mathrm{m}^{-3} \mathrm{HCl}$ .

\mathrm{MnO}_{2}(\mathrm{~s})+4 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{MnCl}_{2}(\mathrm{aq})

Calculate the volume of chlorine, in $\mathrm{dm}^{3}$ , produced if the reaction is conducted at standard temperature and pressure (STP). Use section 2 of the data booklet.

V(\mathrm{Cl_2})=0.0307\,\mathrm{mol}\times22.7\,\mathrm{dm^3\,mol^{-1}}=0.697\,\mathrm{dm^3}

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IB Chemistry SL 1.5.3 Molar Volume Questions question 1