Question

HELP!!
CaCO3(s) + 2HCl(aq) CaCl2(aq) + H2O( ) + CO2

(g)

What is the total number of moles of CO2 formed

when 20. moles of HCl is completely consumed?

A) 5.0 mol B) 10. mol

C) 20. mol D) 40. mol

Answer 1

The total number of moles of CO2 formed : 10

Further explanation

Given

Reaction

CaCO3(s) + 2HCl(aq) ⇒CaCl2(aq) + H2O( ) + CO2 (g)

20. moles of HCl

Required

moles of CO2

Solution

The reaction coefficient in the chemical reaction equation shows the mole ratio of the elements in the reactants and products

From the equation, mol ratio of HCl : CO2 = 2 : 1, so mol CO2 :

= 1/2 x mol HCl

= 1/2 x 20

= 10 moles