Question

What is the mass (in grams) of 9.02 × 1024 molecules of methanol (CH3OH)?

Answer 1

First, what is the total number of each type of atom present? Try listing them in a column like this:
atom 1: 3
atom 2: 2

Then write out the atomic mass next to them:
atom 1: 3 * x.xxxx
atom 2: 2* x.xxxx

Now, sum the masses for all the atoms in the formula. That gives you the molecular mass of one molecule. See if you can get it from there.

Answer 2

Just to make it clear, atom 1= 3 x mass plus atom 2 = 2 x mass, etc.

Answer 3

Thank You!!!

Answer 4

You bet.