Finding the empirical formula is a simple matter of finding the ratio between the number of moles of carbon and the number of moles of hydrogen. In this case the number of moles of C = moles CO2 = 0.465 and,
moles of H = 2xmoles H20 = 0.928
As you can see there is almost exactly a 1:2 ratio between C:H so the empirical formula is CH2