- Solutions 16

Write the empirical formula corresponding to the following molecular formula: (b) C_{8}H_{10}

Okay guys, so in this question we have to write the empirical formula based on the molecular formula that they give us.

So the molecular formula here is C8H10. Remember your molecular formula is going to be your actual formula and your empirical formula is the simplest formula. So we have to find the simplest whole number ratio of the moles that they provide. So in this case we have eight carbons and ten hydrogens. How can we simplify this? Well, we're going to have to first divide both of them by two, both of the ratios by two. Dividing by two, we're going to get C4H5. And now we see that we cannot divide this anymore, or we cannot simplify this anymore, because five divided by an even number for example will give us a decimal, which we don't want, we want a whole number ratio.

So this is going to be the simplest empirical formula possible for C8H10. Let's move on.