24. Determine the moles of excess reactant that remains when 1.60 moles of PCls

Question

24. Determine the moles of excess reactant that remains when 1.60 moles of PCls reacts with 9.0 moles of H20 according to the following equation: PCI5 4 H20g) H3PO4 + 5 HCl. (A) 2.6 moles (B) 1.6 moles (C) 6.4 moles (D) 7.4 moles (E) No correct answer 25. Identify the oxidizing agent in the reaction: Ni (s) + Cl2 (g) NiCl2 (s) (A) NiCI (B) Ni (C) CI (D) No correct answer 26. Identify the reducing agent in the reaction: 3 Fe(NO3)2 (aq) + 2Al (s) 3 Fe (s) +2 Al(NO3)3 (aq) (A) Fe (B) NO3 (C) A (D) No correct answer 27. Identify the gas with the greatest density (All are at the same temperature and pressure): (A)02 B)N2 (C)NO2 (D) NH3 (E) No correct answer 28. Identify the gas with the greatest average molecular speed: (A) 02 (B)N2 (C) NO2 (D) NH3 (E) No correct answer 29. Identify the gas with the greatest total pressure in the image below assuming each is behaving as an ideal gas: (IV) 02 02 N2 0, (A) I (B) II (D) IV (E) No correct answer 30. Identify the gas with the greatest partial pressure in the illustration below (A) Ar (B) N2 (C) 02 (D) All partial pressures are equal. (E) No correct answer 0, 0,

Explanation / Answer

24)

we have the Balanced chemical equation as:

PCl5 + 4 H2O ---> H3PO4 + 5 HCl

1 mol of PCl5 reacts with 4 mol of H2O

for 1.6 mol of PCl5, 6.4 mol of H2O is required

But we have 9 mol of H2O

so, PCl5 is limiting reagent

we will use PCl5 in further calculation

From balanced chemical reaction, we see that

when 1 mol of PCl5 reacts, 4 mol of H2O reacts

mol of H2O reacted = (4/1)* moles of PCl5

= (4/1)*1.6

= 6.4 mol

mol of H2O remaining = mol initially present - mol reacted

mol of H2O remaining = 9 - 6.4

mol of H2O remaining = 2.6 mol

Answer: A

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