The solute in a 500mL bottle labeled 0.18 M HCI is; the solvent is; and the numb
ID: 1018734 • Letter: T
Question
The solute in a 500mL bottle labeled 0.18 M HCI is; the solvent is; and the number of moles of H_3O^+ is a. hydrochloric acid, water, 0.18 moles b. water, hydrochloric acid, 0.18 moles c. hydrochloric acid, water, 0.09 moles d. water, hydrochloric acid, 0.09 moles. The mole fraction of benzene (moles benzene/total moles) in a solution that is prepared from 150 grams of toluene (C_7H_g(l)) and 150 grams of benzene (C_6H_6(l)) a. Is more than the mole fraction of toluene b. The same as the mole fraction of toluene c. Is less than the mole fraction of toluene What is the net ionic equation when 50 ml of silver nitrate is mixed with 50 ml of iron (III) chloride? (Recall the solubility rules - nitrates are soluble, chlorides are soluble except for silver, lead, and mercury). a. AgNO_3(aq) + FeCI_3 (aq) rightarrow AgCI(s) + Fe (NO_3)_3 (aq) c. Ag^+ (aq) + cl' (aq) rightarrow AgCl(s) d. Both b and c are right The K_c for the dissociation of SO_3 at 80 degree C is 0.0035. The chemical equation for this equilibrium dissociation is: 2SO_3(g) 2SO_2(g) + O_2(g) K_c = 0.0035 Two students were independently measuring the equilibrium positions of the components of this reaction under identical conditions. Student A reported that at equilibrium [SO_3] = 0.15 M; []SO_2] = 0.03 M and [O_2] = 0.0875. Student B chose to write the equilibrium expression as: 2SO_2(g) + O_2(g) 2SO_3(g) In student B's lab notebook we should see: a. Identical equilibrium concentrations and the same K-c b. Identical equilibrium concentrations but a larger K_c c. A larger K_c and therefore a higher concentration of oxygen. d. A larger K_c and therefore a lower concentration of oxygen.Explanation / Answer
1. c.
HCl is solute and water is solvent and as 1000ml 1M HCl = 36.5 gm HCl so 0.09 mole of HCl is present.
2. a.
As the molecular weight of toluene is greater than that of benzene.
3. d.
As AgCl is insolube so AgCl is formed.
4. b
(as the reverse reaction is taken as consideration so equilibrium concentration will be receprocal of former.)