IB Chemistry SL 1.5.3 Molar Volume

Practise using the molar volume specified for a particular temperature and pressure, including the data-booklet value at STP. Convert between amount and gas volume, and interpret…

Exam points

convert between gas amount and volume using the molar volume stated for the conditions
compare pressure or volume changes using ratios of absolute temperature rather than Celsius
interpret gas-variable graphs while identifying which quantities are held constant

[Maximum number: 1]

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.

$<0.0307 \mathrm{~mol} \times 22.7 \mathrm{dm}^{3} \mathrm{~mol}^{-1}=>0.697<\mathrm{dm}^{3} \gg$

Marking guidance:

Accept methods employing p V=n R T.

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1.5.3—Molar volume question 1