Asample of propane contains 0.20 moles of carbon how many moles of h are present?

We know that propane is represented by the chemical formula:

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:

Cross multiply and solve for x (moles of 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.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.