Question

Calculate the partial pressure of carbon monoxide from the following data:

$CaC{O}_3\left(s\right)\stackrel{\Delta }{⟶}CaO\left(s\right)+C{O}_2\left(g\right);K_p=8\times {10}^{-2}$

$C{O}_2\left(g\right)+C\left(s\right)\to 2CO\left(g\right)K_p=2$

• A. $0.2$
• B. $0.4$
• C. $1.6$
• D. $4$

Answer 1

The correct option is B $0.4$

Given,
$CaC{O}_3\left(s\right)\stackrel{\Delta }{⟶}CaO\left(s\right)+C{O}_2\left(g\right);K_p=8\times {10}^{-2}$
$\therefore K_p=P_{C{O}_2}=8\times {10}^{-2}$

Again for the reaction,
$C{O}_2\left(g\right)+C\left(s\right)\to 2CO\left(g\right)K_p=2$

$K_p=\frac{{\left(P_{CO}\right)}^2}{\left(P_{C{O}_2}\right)}$

${\left(P_{CO}\right)}^2=2\times 8\times {10}^{-2}=16\times {10}^{-2}$

$P_{CO}=\sqrt{16\times {10}^{-2}}=0.4$