1. ethene, c2h4, burns in oxygen according to the equation. in an experiment, 10cm3 of ethene was burnt in 50cm3 of oxygen.
c2h4 + 3o2 = 2co2 + 2h2o

i) calculate the volume of the oxygen gas remaining at the end of the reaction.
ii) calculate the volume of carbon dioxide produced.

2. what volume(in cm3) of 0.100mol/dm3 copper(ii) sulfate solution is required to react completely with a solution containing 0.0250 mol of sodium hydroxide?
cuso4 + 2naoh = cu(oh)2 + na2so4