When converting grams to molecules, you first have to convert it to moles. In order to do this, you first need to determine how many grams are in one mole of
Start off by looking at your periodic table. If you don't have one on hand, ptable.com has a great interactive one you can use!
Notice that I added the molar mass of Oxygen twice. This is because you were given two molecules of Oxygen to work with (
Now you can start converting! We need to first convert the grams of
With the amount of moles of your sample in hand, we can convert that to the amount of molecules are present in the sample! We do this with Avogadro's number, a constant that allows the conversion between moles and molecules.
Once again, we convert!
There we go!