Question

A sample of propane contains 0.20 moles of Carbon how many moles of H are present?

Answer 1

We know that propane is represented by the chemical formula:
`C_(3) H_(8)`

So the molar ratio of carbon to hydrogen is 3:8.

If we are given 0.2 moles of carbon, we can setup a proportion and solve for the number of moles of hydrogen present:

`(3)/(8) =(0.2)/(x)`

Cross multiply and solve for x (moles of H):

`3x=1.6`

`x=0.53mol_(H)`

So now we know that when we are given 0.2 moles of carbon in propane, we get a respective 0.53 moles of hydrogen that are present.