Question

Convert into mole.
i)12g of oxygen
ii)20g of water
iii)22g of carbon dioxide​

Answer 1

Answer:

(a) 32 g of oxygen gas = 1 mole

Then, 12 g of oxygen gas = 12 / 32 mole = 0.375 mole

(b) 18 g of water = 1 mole

Then, 20 g of water = 20 / 18 mole = 1.111 mole

(c) 44 g of carbon dioxide = 1 mole

Then, 22 g of carbon dioxide = 22 / 44 mole = 0.5 mole

Answer 2

Answer:

1) Given mass of oxygen : 12g

Molar mass Of O = Atomic mass if oxygen

= 16 g/ mol

Now, No. of moles = Given mass / Molar mas

= 12/16

= 0.75

Hence , 12g of oxygen contains 0.75 moles .

2) Given mass of water : 20g

Molar mass of H2O = 2( atomic mass of H)

+ Atomic mass of O

= 2(1) + 16

= 2+16

= 18g/mol

Now, No . of moles = Given mass / molar mass

= 20/18

= 1.12

Hence, 20g of water contains 1.12 moles .

3) Given mass of CO2: 22g

Molar mass of CO2 : Atomic mass of C

+ 2( Atomic mass of O)

= 12 + 2(16)

= 44g/mol

Now, No . of moles = Given mass / Molar mass

= 22/44

= 0.5

Hence, 22g of CO2 contains 0.5 moles.