The reaction used in some carbon-capture systems is At the equilibrium constant for…

CHEMISTRY · Multi-part · A Level · Chemistry · Gaseous equilibria (Kp) · Gaseous equilibria (Kp)

Problem

The reaction used in some carbon-capture systems is

CaO(s) + CO_2(g) \leftrightarrow CaCO_3(s)

298\,\text{K}

the equilibrium constant

K_p

for this reaction is

3.35 \times 10^{3}

. A gas stream containing

CO_2

at a partial pressure of

0.10\,\text{atm}

is passed over an excess of solid

CaO

298\,\text{K}

until equilibrium is established. Answer the following questions. (a) Predict qualitatively whether the conversion of

CaO

CaCO_3

under these conditions will be high, moderate, or negligible. Support your prediction using the given numerical value of

K_p

. (b) Calculate the equilibrium partial pressure of

CO_2

in contact with the solids. (c) Based on your result in part (b), determine whether at least

95\%

of the

CaO

can be expected to convert to

CaCO_3

under these conditions, and justify your conclusion.