Question

Callculate the number of moles in the following: (i) 20 g water (ii) 10 g Carbon Dioxide​

Answer 1

Answer:

Molar mass of Water =H

2

​

O=2+16=18 g/mol

So, 1 mole of water weighs = 18 g

which implies, 18g of water = 1 mole

Therefore, 20g of water =20/18=1.11 mole

Mass of CO2 = 10g

Molar mass of CO2 = 44g/mol

Moles of CO2 =10g/44g/mol = 0.23mol

Number of molecules of CO2= moles X Avogadro's number.

=0.23mol x 6.02 x 10^23

Explanation: