Question

No of atoms in 90 g of water

Answer 1

Answer:

this is the detailed solutions

Answer 2

Answer:

I haven’t done this in a while, but I’ll take a shot.

There is one Oxygen atom in each water molecule, so the number of oxygen atoms is the same as the number of water molecules.

A mole of a compound is a number of grams equal to the atomic weight of a molecule of the compound, so for water we have 2 hydrogen atoms and one oxygen, so the atomic weight of water is 1+1+16=18, so a mole of water is 18 grams.

We have 90g of water so we have 90/18 = 5 moles of water.

The number of molecules in a mole is always the same number, called Avogadro’s number, which is 6.02 X 10 to the power of 23.

So in 90g of H2O there are 5*6.02 X 10**23 = 30.10 X 10**23 = 3.010 X 10**24 molecules of H2O, and that is also the number of oxygen atoms.

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