Find the hydrocarbon

Exercise and reference answers

Questions

1. Hint

   divide the volumes

   Answer

   3

   Question

   20 cm3 hydrocarbon gives 60 cm3 CO2. Carbon atoms per molecule?

2. Hint

   subtract the leftover

   Unit

   cm3

   Answer

   100

   Question

   140 cm3 oxygen supplied, 40 cm3 left. Oxygen used?

3. Hint

   divide the volumes again

   Answer

   5

   Question

   100 cm3 oxygen per 20 cm3 hydrocarbon. Moles of O2 per molecule?

4. Hint

   solve for y

   Answer

   8

   Question

   If x = 3 and x + y/4 = 5, what is y?

Instructions

Work through the combustion data and key in each answer.