Moles Conversion! GRR!?

Question

Studying for Chemistry Test~!

1. Caculate the number of molecules present in 2.74 moles of CO2.
2.Caculate the mass ( in grams) of 3.34x10^23 molecules of H20
3.Caculate of number of moles present in 3.34x10^23 molecules of H20.

Wait, are molecules mols?

Answer 1

There are 6.02x10^23 molecules in a mole.

1. Multiply 2.74 by 6.02x10^23 and get 1.65x10^24 molecules.

2. Divide 3.34x10^23 by 6.02x10^23 and get 0.555 moles of H2O. The molecular weight of H2O is 2(1)+16 or 18. Now take 0.555 moles times 18 grams and get 9.99g of H2O.

3. Just do the first part of the previous question. The answer is 0.555 moles of H2O.

NO. Molecules are not moles. A molecule is two or more elements joined by bonds, in this case, there are two, CO2 and H2O. A mole is the weight (in grams) required to have 6.02x10^23 molecules in one place. It is just the mass of each element in the molecule or compound as found in the periodic table. CO2 is 12 +2(16) or 44 grams, and H2O is 2(1) +16 or 18 grams. 6.02x10^23 is known as Avogadro's Number.

Answer 2

I'm not sure what the difficulty is:

Just remember that 1 mole has 6.02 x 10E23 molecules, and the conversions are easy