Question

Caluclate the number of molecules in 100g of water, and number of mole in 110g of carbon dioxide

Answer 1

Answer:(I)3.33×10^24 (5.5N°) molecules of H2O (ii) 2.5 moles of CO2

Explanation:

As we have to find out no. of molecules in 100g of water,so we have to convert it into moles as we know-

Moles=no. of molecules÷N° ......(I)

(N°=avogadro no.=6.02×10^23)

Also,

Moles= given mass÷molar mass....(ii)

Therefore,

Moles of water=100÷18=5.55

From equation (I)

No.of molecules=5.55×N°=3.33×10^24.

Now,

no. of moles of CO2=

masss of CO2÷44(molar mass)

=110÷44=2.5