Question

How much hydrogen and oxygen is present in 54 gram of water?​

Answer 1

Answer:

We get 1.81×1024 water molecules...

Explanation:

We assess the molar quantity of water in the usual way...

Number of moles=massmolar mass

≡54⋅g18.01⋅g⋅mol−1=3.00⋅mol

But the mol is like the dozen, or the gross, it specifies a NUMBER, here NA≡6.022×1023⋅mol. Why do we use such an absurdly large number? Because NA⋅1H⋅atoms have a MASS of 1⋅g precisely...and thus the mole is the link between the micro world of atoms, and molecules, to the macro world of grams and litres....

And so (finally!) we take the product...

Number of water molecules=molar quantity×Avogadro's number.

=3.00⋅mol×6.022×1023⋅mol−1a number as required..=??⋅water molecules

Answer 2

Answer:

There are

6.022

×

10

23

molecules in a mole.

There are

18.01528

grams of water per mole of water.

These can be figured out using the concept of moles and molecular weight. I have attached a video that provides a good explanation.