1 25 cm3 of a gaseous hydrocarbon, CX Hy, were burnt in 150 cm3 of oxygen. This was an excess of oxygen.
After cooling, the volume of the gases remaining was 100cm3
.
This consisted of 75cm3 of carbon dioxide and 25cm3 of unreacted oxygen.
The water that was produced in the reaction was liquid.
All volumes were measured at the same temperature and pressure.
(a) What is meant by an excess of oxygen?
[1]
(b) What was the volume of oxygen that reacted with the hydrocarbon?
cm3
[1]
(c) Complete the table to show the smallest whole number ratio of volumes.
volume of
hydrocarbon
reacted produced
volume of
oxygen reacted
volume of
carbon dioxide
smallest whole
number ratio of
volumes
[1]
(d) Use your answer to (c) to balance the chemical equation.
Deduce the formula of the hydrocarbon
.
CxHy (g) + O2(g) CO2 (g) + H2O(l)
Formula of the hydrocarbon = [2]