Question

in an experiment of 5g of CaCO3 g on heating gave 2.7 g of CaO and 1120 mL of CO2 at STP. The mass of the CO2 produced is
a)2.8g
b)4.4g
c)5.6g
d)2.2g​

Answer 1

c) 5.6g is a right answer

when caco3 is heated it gave a 2.7g of cao

when 1120 my of co2 heated the mass of co2 is produce 5.6

Answer 2

n = V/22.4L
n = 1.12/22.4 (1120 mL = 1.12 L)
= 0.05 moles

n = W/ molar mass
0.05 = W / 44
W = 2.2g
So, the correct option is d) 2.2g

For verification you can check the total mass on both Lhs and Rhs.


Hope it helps :)