Question

17. 2066 Q.No. 13 What volume of CO2 gas is produced when 20
g of 20% pure CaCO3 is completely heated?
[2]
​

Answer 1

Answer:

Chemical reaction involved is:

CaCO

3

→CaO+CO

2

Molar mass of CaCO

3

=40+12+16×3=100 g

According to the balanced reaction 100 g of CaCO

3

produces 1 mol of CO

2

i.e. 22.4 L at STP.

∴50 g CaCO

3

will produce

100

22.4

×50=11.2 L CO

2

at STP.

Answer 2

Answer:

The balanced equation is:

100g

1mol

CaCO

3

→CaO+

=22.4litreatNTP

1mol

CO

2

100g of CaCO

3

evolve carbon dioxide = 22.4 litre

20g CaCO

3

will evolve carbon dioxide

=

100

22.4

×=4.48litre