Question

1 gm water me Kitna molecules ?

Answer 1

A mole is a convenient counting unit whenever one is dealing with numbers of atoms or molecules. It is equal to Avogadro's number (NA), namely 6.022 x1023. If we have one mole of water, then we know that it will have a mass of 2 grams (for 2 moles of H atoms) + 16 grams (for one mole O atom) = 18 grams.

Answer 2

In a 1 gram of water 6.022 × 10^23 molecules are present.