A sample of a gaseous hydrocarbon, CxHy\text{C}_x\text{H}_yCxHy, is burned completely in excess oxygen within a combustion chamber. The combustion products are passed through a series of absorption tubes, resulting in an increase of 5.28 g in the carbon dioxide absorber and 2.52 g in the water absorber.
The relative formula mass (MrM_rMr) of the hydrocarbon is determined by mass spectrometry to be 86.
Calculate the molecular formula of the hydrocarbon CxHy\text{C}_x\text{H}_yCxHy.
(Relative atomic masses, ArA_rAr: H=1.0\text{H} = 1.0H=1.0, C=12\text{C} = 12C=12; relative formula masses, MrM_rMr: H2O=18\text{H}_2\text{O} = 18H2O=18, CO2=44\text{CO}_2 = 44CO2=44)
