The value of H for the decomposition of POCl3 into its ...

[FButt]

The value of H for the decomposition of POCl3 into its constituent elements, 2POCl3 (g)  P2 (g) + O2 (g) + 3Cl2 (g) is ________ kJ/mol.
 
  A) -1228.7
  B) +1228.7
  C) -940.1
  D) +940.1
  E) 0.00

Question 2

The combustion of propane (C3H8 ) produces CO2 and H2O:
 
  C3H8 (g) + 5O2 (g)  3CO2 (g) + 4H2O (g)
 
  The reaction of 2.5 mol of O2 will produce ________ mol of H2O.
  A) 4.0
  B) 3.0
  C) 2.5
  D) 2.0
  E) 1.0

Question 3

Calculate the pH of a solution prepared by dissolving 0.850 mol of NH3 and 0.300 mol of NH4Cl in water sufficient to yield 1.00 L of solution. The Kb of ammonia is 1.77  10-5.
 
  A) 5.204
  B) 4.300
  C) 9.700
  D) 8.781
  E) 8.796

[Mochi]

Answer to Question 1

B

Answer to Question 2

D

Answer to Question 3

C