Question

When $20g$ of $CaC{O}_3$ were put into $10$ litre flask and heated to ${800}^{\circ }C,30$% of $CaC{O}_3$ remained unreactable equilibrium. $K_P$ for decompostion of $CaC{O}_3$ will be___________.

• A. $1.145atm$
• B. $1.231atm$
• C. $2.145atm$
• D. $3.145atm$

Answer 1

The correct option is B $1.231atm$

$CaC{O}_3\rightleftharpoons CaO+C{O}_2$

$0.2$ $0$ $0$ $\because 30\%$ remains unreactable

$0.6$ $0.14$ $0.14$

$K_p=\left[C{O}_2\right]=0.14$

$K_p=K_c[RT{]}^{△ng}$

$=0.14\times 0.082\times 1073$

$=12.318$

$K_p$ in atm/L

$1.231$