Question

Calculate the number of atom present in 1l of water ( density of water is 1 g/ml)

Answer 1

At STP, the density of water is 1 gm/ml

That means, in 1 litre there would be 1000 gm or 1 kg of water.

Now, mass of a water molecule is 18 gram/mol

So number molecules in 1 litre of water is

= (1000/18) × Na [where Na is Avogadro's number = 6.022 × 10^23]

But what we want is number of atoms.

In a molecule of water, there are 2 hydrogen atoms and 1 oxygen atom

So, in 1 litre of water, there are 2 × (1000/18) × Na hydrogen atoms and (1000/18) × Na oxygen atoms

So in total, there would be 3× (1000/18) × Na atoms.

Answer 2

Explanation:

sorry I canot help you