At standard temperature and pressure, phosphoryl chloride (POCl_3) is a colorles

Question

At standard temperature and pressure, phosphoryl chloride (POCl_3) is a colorless liquid that reacts rapidly with ambient moisture to make HCl gas. What manipulation could be done to the reaction below to make it a formation reaction (Delta H_f) for POCl_3? The standard state for phosphorus is white phosphorus, P_4 (s). 3 Cl (g) + 1/2 O_2 (g) + 1/4 P_4 (s) rightarrow POCl_3 (g) Multiply the reaction by a factor 4 to eliminate all fractions Change 3 Cl (g) to 3/2 Cl_2 (g) Change POCl_3 (g) to POCl_3 (l) (b)and(c) None of the above is necessary-the reaction is a formation reaction as written.

Explanation / Answer

Solution,

Answer is (B). Change 3 Cl (g) to 3/2 Cl2 (g).

Reason:

Only Chlorine is not given for the formation reaction in its elemental state of Cl2 (g). Other parts given in the reaction are OK.

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