KINETICS AND EQUILIBRIUM Shibani Solving problems that mlix equilibrium Ideas wi

Question

KINETICS AND EQUILIBRIUM Shibani Solving problems that mlix equilibrium Ideas with gas laws When limestone (solid CaCO,) is heated, it decomposes into lime (solid CaO) and carbon dioxide gas. This is an extremely useful industrial process of great antiquity, because powdered lime mixed with water is the basis for mortar and concrete- the lime absorbs CO2 from the air and turns back into hard, durable limestone. Suppose some calcium carbonate is sealed into a limekiln of volume 550. L and heated to 750.0 °C. when the amount of CaC0j has stopped changing, it is found that 5.25 kg have disappeared Calculate the pressure equilibrium constantthis experiment suggests for the equilibrium between C 03 and CaO at 7500 C Round your answer to 2 significant digits Note for advanced students: it's possible there was some error in this experiment, and the value it suggests for K, does not match the accepted value. Check 2018 McGrow-Hill Education All Rights Reserved Terms of Us

Explanation / Answer

mass of CaCO3 decompose = 5.25 kg

                                              = 5250 g

moles of CaCO3 = 5250 / 100 = 52.5 mol

CaCO3   ----------------> CaO   + CO2

1 mol CaCO3   ------------> 1 mol CO2

moles of CO2 = 52.5 mol

P V = n R T

P x 550 = 52.5 x 0.0821 x (750 + 273)

P = 8.018

PCO2 = 8.018

Kp = PCO2 = 8.0

Kp = 8.0

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