For the following equilibrium system, which of the changes will form more or les

Question

For the following equilibrium system, which of the changes will form more or less CaCO_3, or cause no change in the amount of CaCO_3? (NOTE: Only TWO submissions are allowed for this question.) CO_2(g) + Ca(OH)_2(s) CaCO_3(s) + H2O(/) deltaH^0 = -113 kJ (a) Decrease temperature at constant pressure (no phase change) more CaCO_3 less CaCO_3 no change (b) Increase volume at a constant temperature more CaCO_3 less CaCO_3 no change (c) Increase partial pressure of CO_2 O more CaCO_3 less CaCO_3 no change (d) Remove one-half of the initial CaCO_3 more CaCO_3 less CaCO_3 no change

Explanation / Answer

Two points which are important in equilibrium are le chaterleirs principle and the fact that concentration of pure solid and pure liquid is always unity.

a. More CaCO3 because above reaction is exothermic (le chaterleirs principle)

B. Less CaCO3 le chaterleirs principle

C. More CaCO3

D. No change because concentration remains unity for CaCO3

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