Determine enthalpy of formation for `H_(2)O_(2)(l)` , using the listed enthalpies of reactions: `N_(2)H_(4)(l) + 2H_(2)O_(2)(l) rarr N_(2)(g) + 4H_(2)
Determine enthalpy of formation for `H_(2)O_(2)(l)` , using the listed enthalpies of reactions:
`N_(2)H_(4)(l) + 2H_(2)O_(2)(l) rarr N_(2)(g) + 4H_(2)O(l), Delta_(r)H_(1)^(@) =-818 KJ//"mol"`
`N_(2)H_(4)(l)+O_(2)(g) rarr N_(2)(g) + 2H_(2)O(l), Delta_(r)H_(2)^(@)=-622 KJ//"mol"`
`H_(2)(g)+(1)/(2)O_(2)(g) rarr H_(2)O(l), Delta_(r)H_(3)^(@)=-285 KJ//"mol"`
A. `-383 KJ//"mol"`
B. `-187 KJ//"mol"`
C. `-498 KJ//"mol"`
D. None of these
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Correct Answer - B
For `H_(2)(g) + O_(2)(g) rarr H_(2)O_(2)(l)`
`Delta_(f)H^(@)(H_(2)O_(2),l) = Delta_(r)H_(3)^(@) + (DeltarH_(2)^(@))/(2) - (DeltarH_(1)^(@))/(2)`
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