Answer:
The answer to your question is  CH₄
Explanation:
Process
1.- Write the possible chemical reaction
                    CxHy + O₂   ⇒    CO₂  +   H₂O
2.- Calculate the amount of carbon in the reaction
Molecular mass of CO₂ = 12 + 32 = 44 g
                          44 g of CO₂ ------------------- 12 g of carbon
                          93.5 g of CO₂ ----------------  x
                           x = (93.5 x 12) / 44
                           x = 25.5 g of carbon
3.- Calculate the mass of hydrogen in the sample
Molecular mass of water = 2 + 16 = 18 g
                          18 g of water -------------   2 g of hydrogen
                           76.5 g of water --------    x g of hydrogen
                            x = (76.5 x 2) / 18
                            x = 8.5 g of hydrogen
4.- Calculate the moles of carbon and hydrogen in the sample
                            12g of carbon ------------- 1 mol 
                            25.5g of carbon ---------- x
                              x = (25.5 x 1) / 12
                               x = 2.12 moles of carbon
                             1 g of hydrogen ----------- 1 mol
                             8.5 g of hydrogen -------- x
                              x = (8.5 x 1) / 1
                              x = 8.5 moles of hydrogen
5.- Divide both number of moles by the lowest number
carbon = 2.12 / 2.12 = 1
hydrogen = 2.12 = 8,5 / 2.12 = 4
6.- Write the molecular formula
                                                     CH₄