A reaction has a large positive value of Delta G degree at 298 K The value of th

Question

A reaction has a large positive value of Delta G degree at 298 K The value of the equilibrium constant for this reaction at this temperature would be much less than 1 much greater than 1 approximately 1 No conclusion can be drawn Which reaction has a Delta S degree_ns > 0? 2H_2 (g) + O_2(g) rightarrow 2H_2O(g) Ag'(aq) + Cl^- (aq) rightarrow AgCl(s) What is the correct equilibrium expression for this reaction? CaCO_3(s) + 2HCl(aq) CaCl_2(aq) + H_2O(I) + CO_2(aq) K_c = [CaCl_2]/[HCl]^2 K_c = [CaCl_2][H_2O][CO_2]/[HCl]^2 What is the molar solubility of TIBr in pure water at 25 degree C? 1.38 times 10^-11 M 1.93 times 10^-6 M 1.93 times 10^-3 M 3.71 times 10^-3 M In which solution will AgCl be the least soluble? pure water 0.007 M AgNO_3 0.02 M NH_3 0.2 M HCl Which salt will produce a neutral solution when dissolved in water? NaBr NaCN NaF NaOCl At 95 degree C, K_w is approximately 1.0 times 10^-13. What is the pH of pure water at this temperature? 13.00 7.50 7.00 6.50 Which species acts as a Lew is base? CH_s PH_3 H^+ NH_4^+ Which experiment is shown in the diagram? The titration of the weak acid by adding a strong base. The titration of a strong base by adding a weak acid. The titration of a strong acid by adding a strong base. The titration of a strong base by adding a strong acid. What is [H_3O^6] for a 0.0150 m NH_3 solution? 6.6 times 10^-13 M 1.9 times 10^-11 M 3.8 times 10^-8 M 5.2 times 10^-4 M Which pair of substance will form an aqueous buffer with pH.> 7 when equimo lar solutions are mixed? CH_3CO_2H/CH_3CO_2Na HF/NaF NaOH/NaCl HOCl/NaOCl What is the pH of a 0.35 M solution of HCN? K_a [HCN]- 4.9 times 10^-10 9.31 9.12 4.88 A mixture of gaseous nitrogen, hydrogen, and is placed in a scaled container and brought to equilibrium. Which change to the system will an increase in the number of moles of nitrogen N_2(g) + 3H_2(g) 2NH_3(g) Increasing the temperature of Removing NH_3 from the mixture Adding H_2 to the mixture Compressing the mixture

Explanation / Answer

Answer – 52) We are given that value of the Go is large positive and we know the relationship between Go and K

Go = - RT ln K

When the Go is positive then lnK equal to get negative value and the antiln of negative values is less than 1, so answer for this one is A) much less than 1.

53) We are given the reactions and we need to look for the reaction which has positive So, means it is greater than 0.

We know for the positive standard entropy there is must increase in the disorder. In A there are 3 moles of gas converted to 2 moles, so So is negative.

In B there is aqueous gets converted to solid, so disorder decrease and So is negative

In C there are 2 moles of gas converted to 4 moles of gas , so in this one disorder increase and So is positive

So answer for this is reaction C) 2NH3(g) ----> 3H2­(g) + N­2(g)

54) We are given the reaction and need to write the equilibrium constant expression

CaCO3(s) + 2HCl(aq) <----> CaCl2(aq) + H2O(l) + CO2(aq)

We know in the equilibrium constant expression there are only aqueous and gases phase count. There is product by reactant as follow –

Kc = [CaCl2] [CO2] / [HCl]2

So answer for this one is option B.

55) We are given the , Ksp of TiBr = 3.71*10-6

We know the Ksp expression for the TiBr

Ksp = [Ti+][Br-]

3.71*10-6 = x*x

So, x = 1.93*10-3 M

So, molar solubility of TiBr is C) 1.93*10-3 M

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