Question

numerical on molecular mass and mole concept.​

Answer 1

Molar Mass of H2O H 2 O = 2 + 16 = 18 g/moles.

So ,number of moles of H2O H 2 O = Mass/Molar Mass = 54/18 =3 moles.

Now 1 moles = 6.022×1023 6.022 × 10 23 molecule.

So 3 moles will have 18.066×1023 18.066 × 10 23 molecule.

Answer 2

How many molecules of water are there in 54 g of H2O ?

Solution:-

Molar Mass of H2O = 2 + 16 = 18 g/moles

So ,number of moles of H2O

= Mass/Molar Mass = 54/18 =3 moles

Now 1 moles = 6.022×10^23 molecule

So 3 moles will have 18.066×10^23molecule