The balanced chemical equation for the reaction between PCI_ and water is given

Question

The balanced chemical equation for the reaction between PCI_ and water is given below. If 3.45 moles of HCl are produced, how many moles of water reacted? PCl_ (aq) + 4 H_2O rightarrow H_3PO_4 (aq) + 5 HCl (aq) A) 0.690 mol B) 0.863 mol C) 2.76 mol D) 3.45 mol E) 4.31 mol A 0.50 M solution of sodium chloride in an open beaker sits on a lab bench. Which of the following would decrease the concentration of the salt solution? A) Add water to the solution. B) Pour some of the solution down the sink drain. C) Add more sodium chloride to the solution. D) Let the solution sit out in the open air for a couple of days. E) At least two of the above would decrease the concentration of the salt solution. Write a balanced net ionic equation for the reaction of H_2SO_4 (aq) with Ba(OH)_2 (aq). A) H_2SO_4 (aq) + Ba (OH)_2 (aq) rightarrow BaSO_4 (s) + 2 H_2O B) 2 H^+ (aq) + SO_4^2- (aq) + Ba^2+ (aq) + 2 OH^- (aq) rightarrow BaSO_4(s) + 2 H_2O C) H^+ (aq)+ OH^+ (aq) rightarrow H_2O D) Ba^2+ (aq) + SO_4^2 -(aq) rightarrow BaSO_4 (s) Write a balanced net ionic equation for the reaction of AgNO_3 (aq) with KBr (aq) A) AgNO_3 (aq) + KBr (aq) rightarrow AgBr (aq) + KNO_3 (s) B) Ag^+ (aq) + NO_3^- (aq) + K+ (aq) + Br^- (aq) rightarrow Ag^+(aq) + Br^-(aq) + KNO_3 (s) C) Ag^+ (aq) + NO_3^- (aq) + K^+ (aq) + Br^-(aq) rightarrow AgBr (s) + K^+ (aq) + NO_3^-(aq) D) Ag^+ (aq) + Br^-(aq) rightarrow AgBr (s) Which species functions as the reducing agent in the following reduction-oxidation reaction? ZnO (s) + C (s) rightarrow Zn (s) + CO (g) A) C B) CO C) Zn D) ZnO In the unbalanced equation shown below how many moles of electrons are transferred per mole of reducing agent? C_2O_42- (aq) + MnO4^- (aq) rightarrow CO_2 (aq) + Mn^2+ (aq) A) 1. B) 2 C) 4 D) 10 Of the following, which atom has the largest atomic radius? A) Cl B) Br C) Na D) K Which ionization process requires the most energy? A) P(g) rightarrow P^+(g) + e^- B) P^+(g) rightarrow P^2+ (g) + e^- c) P^2+(g) rightarrow P^3+(g) + e^- D) P^3 +(g) rightarrow P^4 + (g) + e^-

Explanation / Answer

33. PCl5(aq) + 4H2O(l) ----> H3PO4(aq) + 5HCl(aq)

According to stoichiometric coefficient of equation it is clear that 4 moles of water react to produce 5 moles of HCl.

So number of moles of water reacted to produce 3.45 moles of HCl = (4/5)*3.45 = 2.76 moles

So option (c) is correct.

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