Name ................................................
Homework Molar Volume
Date due ..........................................
1.
Calculate the volume composition of the gases present when 50 cm3 of butane is
burned in 500 cm3 of oxygen.
C4H10(g) + 6.5 O2(g)
4CO2(g) + 5H2O(l)
2
2.
Calculate the volume composition of the gases present when 45 cm3 of propene
is burned in 300 cm3 of oxygen assuming that all measurements are made at
a) room temperature.
2
b) 200°C.
3.
Calculate the volume of hydrogen gas formed when 3.25 g of zinc is reacted with an
excess of dilute sulphuric acid. Take the molar volume of a gas, under the
conditions of the experiment, to be 24.0 l mol–1.
Zn(s) + H2SO4(aq)
ZnSO4(aq) + H2(g)
2
4.
Calculate the mass of calcium carbonate required to form 2.8 litres of carbon dioxide
when the calcium carbonate is reacted with an excess of dilute hydrochloric acid.
Take the molar volume of a gas, under the conditions of the experiment, to be
22.4 l mol–1.
CaCO3(s) + 2HCl(aq)
CaCl2(aq) + CO2(g) + H2O(l)
2
5. When copper(II) nitrate is heated strongly it decomposes to form copper(II) oxide,
nitrogen dioxide and oxygen.
a) Write a balanced chemical equation for the decomposition of copper(II)
nitrate
....................................................................................................................................................
b) Calculate the volume of each gas present in the mixture formed when
18.4 g of copper(II) nitrate fully decomposes. Take the molar volume of a gas,
under the conditions of the experiment, to be 23.8 litres.
1
2
6. A flask has a capacity of 600 cm3. It was filled with sulphur dioxide and the results
used to calculate the molar volume of sulphur dioxide.
Results:Mass of evacuated (empty) flask
=
Mass of flask filled with SO2
=
412.86 g
414.46g
Use these results to calculate the molar volume of sulphur dioxide.
2
Total = 14marks