An unknown hydrocarbon is burned in the presence of oxygen in order to determine its empirical formula. Another sample of the hydrocarbon is subjected to colligative property tests in order to determine its molecular mass.
a) calculate the empirical formula of the hydrocarbon, if upon combustion at STP, 9.01 grams of liquid H2O and 11.2 liters of CO2 gas are produced.
b) determine the mass of the oxygen gas that is used.
c) the hydrocarbon dissolves readily in CCl4. a sollution prepared by mixing 135 grams of CCl4 and 4.36 grams of the hydrocarbon has a boiling point of 78.7 degrees Celcius. the molal boiling-point-elevation constant of CCl4 is 5.02 degrees Celcius per molal, and its normal boiling point is 76.8 degrees Celcius. calculate the molecular weight of the hydrocarbon.
d) determine the molecular formula of the hydrocarbon