How many molecules of H2O are in 100kg of snow?????

Question

I'm a 1st year earth and enviromental science student in UCC and i'm completely hopless at Chemistry! Please help!!!!

Answer 1

1kg is 1kg being snow or water
the molecular weight of water H2O =2*1+16=18g
so 100kg = 10^5g is equivalent to
10^5/18 =5556moles of water
1mole contains 6.02*10^23 molecules

so number of molecules =
6.02*10^23*5556=3.34*10^27 molecules

Answer 2

Every 18 grms of water (or snow) is 1 mole since adding the weights of two hydrogens and one oxygen gives 18.
1 mole of vany thing has 6 x 10^23 particles.
How many moles in 100kg?
That will be 100 x 1000/18 (do you see this?)
About 5500 moles.
So the answer is 5500 x 6 x 10^23
About 33,000 x 10^23
Tidy up to 3.3 x 10^27.

Answer 3

Molecular weight of water = 18 g/mol
100 Kg = 100000 g
100000 g / 18 = 5555.5 moles of water
5555.5 x 6.02x10^23 = 3.34 x 10^27 molecules of water

Answer 4

100 kg snow = 100 kg H2O = 100,000 g H2O

moles of H2O = 100,000 g H2O / 18.02 g/mol (molecular mass of H2O)

Molecules of H2O = moles of H2O X 6.022x10 E23 molecules/moles (Avogadro's number)

I'll leave you to plug the numbers into a calculator, as mine is currently non-functional!

Answer 5

A(H)=1.0079g/mol
A(O)=15.9999g/mol
Therefore in H20 there are (2*1.0079(H)+15.9999(O))/mol(H2O)=18.015g/mol(H2O)
in 100kg there are100000g's
and(100000/18.015)moles
In 1 mole there are 6.023*10^23 molecules(Avogandro's constant)
Therefore in (100000/18.015)moles there are
(6.023*10^23)(100000/18.015) molecules.

Answer 6

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