13. What is total mass of hydrogen in 2 moles of ethanol? 14. How many atoms of hydrogen are in 5 molecules of ethanol? 15. How many atoms of hydrogen are in 5 moles of ethanol?

Answer 1

Start with the chemical formula for ethanol: C₂H₆O

Find molecular weight using periodic tables: about 46 grams per mole

For 2 moles, multiply molecular weight by 2

In each molecule, there are 6 H atom. So for 5 molecules, there 30 H atoms.

Convert moles to molecules my multiplying by Avogadro's number. Multiply this by 6 since there are 6 hydrogen atoms per molecule.