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Determine enthalpy of formation for H(2)...

Determine enthalpy of formation for `H_(2)O_(2)(l)`, using the listed enthalpies of reaction :
`N_(2)H_(4)(l)+2H_(2)O_(2)(l)toN_(2)(g)+4H_(2)O(l)`,
`" "Delta_(r)H_(1)^(@)=-818kJ//mol`
`N_(2)H_(4)(l)+O_(2)(g)toN_(2)(g)+2H_(2)O(l)`
`" "Delta_(r)H_(2)^(@)=-622kJ//mol`
`H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l)" "Delta_(r)H_(3)^(@)=-285kJ//mol`

A

`-383" kJ"//mol`

B

`-187" kJ"//mol`

C

`-498" kJ"//mol`

D

None of these

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The correct Answer is:
B
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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"

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