To convert 500cm3 into grams?

Question

Please its urgent my assignments due in wednesday and i have looked everywhere for this conversion and can't find it. I need it to work out the mole.

Answer 1

1m³ of pure water = 1,000L = 1,000kg (The density of pure water at 4°C.
1 litre of pure water = 1,000cc = 1,000g.
Therefore, 500cc = 500g.
For any other liquid, if it's Specific Gravity is known, Simply multiply 1,000cc by the S.G. to get its mass in grams. (This way, you're comparing the density of the liquid to that of water (which is the standard)).

e.g. 1...Gasoline has a S.G. of around 0.750.
Its Density therefore, is 0.750 (gasoline) x 1,000g/L (water) = 750g/L for gasoline.
e.g. 2...Mercury has a Density of 13,600kg/m³ .
(or 13,600g/L). 13,600g/L ÷ 1,000g/L (water) = Specific Gravity of Hg = 13.6. (g/L cancel....S.G. has no units).

Moles in 500cc of water....(500cc = 500g).
Water Mol.mass = 2 x H + 1 x 'O' = 2 +16 = 18g/mole.
Moles = Mass/Mol.mass = 500g/18g/mole = 27.8moles.
For any other substance simply divide the mass of substance by it's mol.mass to give moles.

e.g. How many moles are there in 250g of NaCl (common salt).
From the Periodic Table, we get the Mol.mass of NaCl...
= 23 (Na) + 35.5 (Cl) = 58.5g/mole.
250g/58.5g/mole = 4.274moles NaCl.

Answer 2

You need the density.

Answer 3

If it's water that's 500g, but Paul is right if it is not water.

Answer 4

It depends on the element...