Question

Consider the following reaction sequence${CaCl}_{2\left(aq\right)}+{CO}_{2\left(g\right)}+H_{2}O\to {CaCO}_{3\left(s\right)}+{2HCl}_{\left(aq\right)}$${CaCO}_{3\left(s\right)}\stackrel{heat}{\to }{CaO}_{\left(s\right)}+H_2{O}_{\left(g\right)}$if the percentage yield of the $1st$ step is $80$ and that of the $2nd$ is $75$, then what is the expected overall percentage yield producing $CaO$ from ${CaCl}_2$?

• A. $50$
• B. $70$
• C. $55$
• D. $60$

Answer 1

The correct option is D $60$

${CaCl}_2⟶{CaCO}_3$ from question

$100gm⟶80gm$

${CaCO}_3⟶CaO$

$100gm⟶75gm$

$80$% $⟶60$%

$\therefore$ The percentage of yield of $CaO$ is $60$%.