Question

Select the one equation shown below for which the enthalpy change is a heat of formattion....

Select the one equation shown below for which the enthalpy change is a heat of formattion.

(a) H2 (g) +O2 (g) --->H2O2 (l) (b) H2 (g)+Br2(l)--->2HBr (g) (c) C2H4 (g)+H2(g) --->C2H6(g) (d) O2(g)+2F2(g)--->2OF2(g)

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Answer #1

heat of formation of compound is the amount of heat required to form one mole of a compund from its substituent elements in their respective standard states

1)here H2 and O2 are in their standard states(gases) and form one mole of H2O2.This represents heat of formation of H2O2

2)here H2 and Br2 are in their standard states(gases) but two moles of HBr is formed.This is incorrect

3)This doesnot represent the heat of formation of C2H6 as it is not formed from its respective elements

4)here also 2 moles of OF2 is formed.This is also incorrect

so the correct answer is a

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