This question is about hydrocarbons.
10 cm3 of a gaseous hydrocarbon, CxHy, was reacted with 100 cm3 of oxygen gas, an excess. The final volume of the gaseous mixture was 95 cm3.
This gaseous mixture was treated with concentrated, aqueous sodium hydroxide to absorb the carbon dioxide present. This reduced the gas volume to 75 cm3.
All gas volumes were measured at 298 K and 100 kPa.
i)
Write an equation for the reaction between sodium hydroxide and carbon dioxide.
[1]
ii)
Calculate the volume of carbon dioxide produced by the combustion of the hydrocarbon.
volume of CO2 produced = ................. cm3
[1]
iii)
Calculate the volume of oxygen used up in the reaction with the hydrocarbon.
volume of O2 used = ................. cm3
[1]
iv)
Use your answers to (b)(ii) and (b)(iii), together with the initial volume of hydrocarbon, to balance the equation below.
............CxHy + ............O2 → ............CO2 + zH2O
[2]
v)
Deduce the values of x, y and z in the equation in (iv).
x = .............................
y = .............................
z = .............................
[3]