Question

The number of moles of CO2 produced when 3 moles of HCl react with excess of CaCO3 is
a) 1
b) 1.5
c) 2
d) 2.5

Answer 1

The reaction is :

Ca CO₃  + 2 H Cl  =>  Ca Cl₂ +  CO₂  +  H₂ O

2 moles of H Cl  produces 1 mole of CO₂.  Hence,  3 moles will produce 1.50 moles.

Answer 2

Answer : The number of $CO_2$ produced are, 1.5 moles.

Solution :

The balanced chemical reaction will be,

$CaCO_3(s)+2HCl(aq)\rightarrow H_2O(l)+CO_2(g)+CaCl_2(aq)$

From the balanced chemical reaction, we conclude that

As, 2 moles of $HCl$ react to gives 1 mole of $CO_2$

So, 3 moles of $HCl$ react to gives $\frac{3}{2}=1.5moles$ of $CO_2$

Therefore, the number of $CO_2$ produced are, 1.5 moles.