From the given information, what is the standard enthalpy of formation for `Al_(2)O_(3)(s)` ?
`2Al_(2)O_(3)(s)to4Al(s)+3O_(2)(g),DeltaH_(rxn)^(@)=3352kJ`

Options

A. `-6704kJ//mol`
B. `-3352kJ//mol`
C. `-1676kJ//mol`
D. `1676kJ//mol`

Answer

C

Explanation

`T.R : 2Al_(s)+(3)/(2)O_(2(g))toAl_(2)O_(3(s),DeltaH_(r)=DeltaH_(f)`
`DeltaH_(f)-(3352)/(2)=1676kJ//mol`