A sample of a hydrocarbon is combusted completely in O2(g) to produce 21.83 g CO2(g), 4.47 g

Question:

A sample of a hydrocarbon is combusted completely in O2(g) to produce 21.83 g CO2(g), 4.47 g H2O(g), and 311 kJ of heat.
(a) What is the mass of the hydrocarbon sample that was combusted?
(b) What is the empirical formula of the hydrocarbon?
(c) Calculate the value of ΔH°f per empirical-formula unit of the hydrocarbon.
(d) Do you think that the hydrocarbon is one of those listed in Appendix C? Explain your answer.