Question

Decide which of the following statements are True and which are False about equilibrium systems: For the following reaction: CaCO3(s) = CaO(s) + CO2(g) the (CaCO3] appears in the denominator of the equilibrium expression. For the following reaction: H2(g) + F2(g) = 2HF(g) the values of K and Kp are not the same. The value of K at constant temperature depends on the amounts of reactants and products that are mixed together initially. A large value of K means the equilibrium position lies far to the left. For a reaction with K >> 1, the rate of the forward reaction is greater than the rate of the reverse reaction at equilibrium. Submit Answer Tries 0/99

Answer 1

AnsFor the following reaction : Calog(s) = Cao Cs) + (029) the [cacog] appears in the denominator of the equillibrium . expression False | keq. = [coo cgs] Concentration of pure solidie. C Pure Solid ) - | [Pure liquid ] = 1 For solid, the active mass of pure solid is constant and if pure liquid is present in excess (as solvent ) , its active mass is also constant. Reason why molar conc. of pure solid or pure liquid is constant. Molare conc. = Moles of substance volume of substance (inh) = Mass of substance Molar mass of substance X volume of substance Molave conc. - Density of substance Molecular Mass of substence As, density is constant at a particular temperature and molecular mass of substance as also constant, therefore molar concentration is constant

ii) For the following the value of k reaction: He cgo + F2 (g) ? Q HF Cg) and kp are not the same Tra kp = Pug PEZ PV = nRT or P= I RT - CRT PHg = CHART , P = CERT. , PHE = CHERT kp = CHART & CEART - [CHERT)? Co. CF (RTS TCHE? (Both (kp = ke for the above reaction the value of kp is equal to k. (iii) The value of k at constant temperature depends on the amount of reactants and products that are mixed together initially False The value of k depends on the concentration of Heac tants and products at equilli brúum not initial amounts of reactant and product.

(iv) position A large value of K means the equillibarium far to the left [True The value of k means the reaction is in forward direction which means, con centeration of products is much lovegen than, reactants concentration at equillibrium. The reaction is almost go to completion. For a reaction with k >>1. the rate of the forward reaction is greater than the rate of the reverse at equillibrium. True k=ke kg = Rake of forward reaction Kb = Rale of backward reaction - greater than for k>>1, the vakee of Ks should be Kb.cice reaction mixture mostly contain products,