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Red phosphorus reacts with liquid bromin...

Red phosphorus reacts with liquid bromine in an exotermic reaction `:` `2P_((s))+3Br_(2(l))rarr2PBr_(3(g))` `Delta_(r)H^(@)=-243kJ`. Calculate the enthalpy change when `2.63g` of phosphorus with an excess of bromine in this way.

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`:' 2 mol e ` of `P` produces heat `=243kJ`
`:. (2.63)/(31) mol e` of `P` produces heat
`=(243xx2.63)/(31xx2)=10.31kJ`
`:. `Heat produced`=10.31kJ`
`DeltaH=-10.31kJ`
`(` The evolution of heat is exothermic in nature `)`
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P BAHADUR-THERMOCHEMISTRY-Exercise 9 Advance numerical problems
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