How many moles is 3.6 grams of H2O?

Question

just tell me how to convert grams into moles and vice versa...

Answer 1

0.1998 mols. Rounded it would be 0.20 mols. To get the answer just take 3.6 grams and divide it by the molar mass of water, which is 18.02 grams/mol.

Answer 2

Find out how much H2O there is in one mole.
The Mr or H=1 and the Mr of O=16, so the Mr of H2O=1+1+16=18
so = 1 mole: 18g
X (unknown) moles : 3.6g
By doing cross multiplication you get : 1 x3.6= X(unknown) x 18
When you re arrange this equation you should get:
3.6/18=X
Therefore X=0.2
Hope this helps!
xXx

Answer 3

You use the molar mass of the compound you are using. Water will be 18 grams per mole because Hydrogen's mass is 1 and Oxygen's mass is 16. You have 2 hydrogens and 1 oxygen. So:

2(1) + 1(16) = 18 g/mol.

Then use the mass you are given of water and the molar mass of water to change to moles:

3.6 g / (1mol/18 g) = 0.2 moles.

The grams are on the bottom of the "fraction" because you need it to cancel out and give you the unit mole.

Answer 4

easy

a mole is, by definition, Avogadro number (about 6.02E23) molecules / atoms of any substance, and its mass is, in grams, the atomic mass of the atom / molecule.

so take the H2O molecule. It is made of 2 H atoms, each with atomic mass 1 (1 proton in the nucleus). And of 1 O atom, atomic mass 16 (8 protons, 8 neutrons).

so the atomic mass of the H2O molecule is 2*1 + 16 = 18 amu's (atomic mass units).

so one mole of water is 18 grams (and will contain 6.02E23 molecules).

in this case you have 3.6 grams of water, which is 1/5th of a mole, or 0.2 mole.

And it will contain 1.2E23 molecules. Which, if you think about it for a second, is a lot.

Answer 5

3.6 Grams

Answer 6

mole = #g / #MW = answer (what is the molecular weight, MW, of water?) Then, #molecules = #mol x Avagadro's constant (6.022E23 molecules/mole) = answer ♠

Answer 7

n(moles) = m(weight) / M ( molecular / atomic density weitht of the substance )