Calculating Atoms & Molecules in H20 - Is It Correct?

[dnt]

say for example, a question states that you have 18 g of H20 which is obviously one mole.

now if they asked how many molecules of water you had, you would just multiply the one mole by avagadros number (6.022 * 10^23) to get that answer.

if they asked how many atoms of water, would it be the same?

now what if they asked how many atoms of hydrogen would be created? would you then take the previous answer and multiply by 2?

is that correct?

 

[andrewchang]

there's no such thing as an atom of water, but if they asked you how many atoms are in a mole of water, you would take the number of molecules of water and multiply it by 3 to get the atoms.

if they wanted the atoms of hydrogen, then your answer would be correct.

 

[Blueshift5]

I would say that your approach is correct. The formula for calculating the number of atoms in a substance is to multiply the number of moles by Avogadro's number. In the case of H20, which has 2 atoms of hydrogen and 1 atom of oxygen, multiplying the number of moles by 2 would give you the number of atoms of hydrogen. Therefore, if you have 18 g of H20, you would have 6.022 * 10^23 molecules and 1.2044 * 10^24 atoms of hydrogen. This calculation is based on the concept of the mole, which is a unit of measurement used in chemistry to represent a specific number of particles. I would also suggest checking your calculations and units to ensure accuracy.