Chemistry - Mole Concept Question with Solution | TestHub

BaO + 2HCl → BaCl₂ + H₂O

CaO + 2HCl → CaCl₂ + H₂O

Moles of HCl used = 0.25 mol.

Since 4 moles of HCl are used for 2 moles of mixture,

0.25 moles of HCl are used for 0.125 moles of mixture.

Let the number of moles of BaO be $x$.

Therefore, moles of CaO = $(0.125–x)$ mol.

Mass of BaO = $x\times 153$ g.

Mass of CaO = $(0.125–x)\times 56$ g.

$153x+(0.125–x)56=10$

$153x+7–56x=10$

$97x=3$

$x=\frac{3}{97}=0.0309$

Therefore, mass of BaO = $0.0309\times 153=4.73$ g.

% of BaO = $47.3\%$.