Enthalpy 1

Chemistry Level pending

Red phosphorus reacts with liquid bromine in the following exothermic reaction:

\[2 \text{P}(s) +3 \text{Br}_{2}(l) \rightarrow 2 \text{PBr}_{3}(g),\qquad\Delta H=-243.0\text{ kJ}\]

Calculate the enthalpy change when \(5.26\) g phosphorus reacts with an excess amount of bromine.

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