Question

The mass of a molecule of water is :
(1) 3 x 10-25 kg (2) 3 x 10-25 kg
(3) 1.5 x 10-26 kg (4) 2.5 x 10-26 kg.​

Answer 1

Answer:

(1) 3 x 10-25 kg

Explanation:

As atomic mass of hydrogen is 1 and oxygen is 8. So, atomic mass of H2O is {(1×2) + 16} = 18.

So, 1 mole of H2O have 18 gm mass.

Also, 1 mole of H2O have 6.023×10^23 molecules.

So, mass of 1 molecule of H2O is 18/6.023×10^23 gm = 2.988× 10^-26 Kg.

Note; 1 mole of anything means it have 6.023 ×10^23 anything (it may be electron, proton, atom, molecule, etc,).

6.023×10^23 is a numeric value and is called Avogadro's number.

Answer 2

Answer:

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