Question

Give the ΔH value for the decomposition of phosphorus pentachloride as shown in the reaction PCl5(g)+67 kJ→PCl3(g)+Cl2(g) . Express your answer using three significant figures. If the value is positive, do not include the + sign in your answer. Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type nothing kJ

Answer 1

The ΔH value for the given reaction is:

-67 kJ

To summarize:

The reaction is:

PCl5(g) → PCl3(g) + Cl2(g)

The ΔH value provided is +67 kJ.

Since the reaction is shown as decomposition (one reactant to two products), the ΔH sign should be reversed.

Expressing the answer using 3 significant figures gives -67 kJ.

So the ΔH value for the decomposition is -67 kJ.

Step-by-step explanation:

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