Question

$10g$ of a mixture of $BaO$ and $CaO$ requires $100{cm}^3$ of $2.5M$ $HCl$ to react completely. The percentage of calcium oxide in the mixture is approximately:
(Given: molar mass of $BaO=153$)

• A. $55.1$
• B. $47.4$
• C. $52.6$
• D. $44.9$

Answer 1

The correct option is C $52.6$

Assuming $x$ gm of $CaO$ was present.

Equivalents of $CaO$ +Equivalents of $BaO$ = Equivalents of $HCl$

$2\times \frac{x}{56}+2\times \frac{(10-x)}{153}=2.5\times 0.1$

$x\simeq 5.26gm$

$\%CaO=52.6\%$