Question

Calculate number of moles of CaO in,
(1)40g
(2)15g of compound.​

Answer 1

Answer:

Since, on heating it gives the following balanced reaction,

CaCO  

3

​  

→CaO+O  

2

​  

 

Also, g-moles means moles of the species, and moles =  

molecular weight of compound  

mass of compound

​  

 

So moles of CaCO  

3

​  

 =  

100

42.54

​  

 = 0.4254

Hence, moles of CaO = moles of CaCO  

3

​  

 = 0.4254 (as per Stoichiometric coefficient of the reaction)

and mass of CaO = moles of CaO X molecular mass of CaO = 56X0.4254 = 23.8224gm