Question

19 gm mixture of Na2CO3 and NaHCO3 on heating gives 2.2 gm CO2 gas. Find % NaHCO3 by mass in mixture.​

Answer 1

Answer:

2NaHCO

3

Δ

Na

2

CO

3

+H

2

O+CO

2

1.12 L CO

2

at STP corresponds to

22.4L/mol

1.12L

=0.05 moles.

0.05 moles of CO

2

will come from 2×0.05=0.1 mole of NaHCO

3

.

The molar mass of NaHCO

3

is 84 g/mol. Mass of 0.1 moles of NaHCO

3

=84×0.1=8.4g

Mass of Na

2

CO

3

=19−8.4=10.6g