Calculate the heat of formation of \[PC{{l}_{5}}(s)\] from the following data \[2P(s)+3C{{l}_{2}}(g)\,\,\to \,\,2PC{{l}_{3}}(l);\,\Delta H=-151.8\,kcal\] \[PC{{l}_{3}}(l)+C{{l}_{2}}(g)\,\,\to \,\,PC{{l}_{5}}(s);\,\,\Delta H=-32.8\,kcal\] [JIPMER 1999]

Calculate the heat of formation of \[PC{{l}_{5}}(s)\] from the followi

1.	Calculate the heat of formation of \[PC{{l}_{5}}(s)\] from the following data \[2P(s)+3C{{l}_{2}}(g)\,\,\to \,\,2PC{{l}_{3}}(l);\,\Delta H=-151.8\,kcal\] \[PC{{l}_{3}}(l)+C{{l}_{2}}(g)\,\,\to \,\,PC{{l}_{5}}(s);\,\,\Delta H=-32.8\,kcal\] [JIPMER 1999]
A.	? 108.7 kcal
B.	+ 108.7 kcal
C.	? 184.6 kcal
D.	+ 184.6 kcal
Answer» B. + 108.7 kcal

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Calculate the heat of formation of \[PC{{l}_{5}}(s)\] from the following data \[2P(s)+3C{{l}_{2}}(g)\,\,\to \,\,2PC{{l}_{3}}(l);\,\Delta H=-151.8\,kcal\] \[PC{{l}_{3}}(l)+C{{l}_{2}}(g)\,\,\to \,\,PC{{l}_{5}}(s);\,\,\Delta H=-32.8\,kcal\] [JIPMER 1999]

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