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Mg(s) + 2HCl(aq) rarr Mg Cl(2) (aq) + H(...

`Mg(s) + 2HCl(aq) rarr Mg Cl_(2) (aq) + H_(2)(g) , Delta_(r )H^(@) = -467 kJ//mol`
`MgO(s) + 2HCl (aq) rarr MgCl_(2)(aq) + H_(2)O (l), Delta_(r )H^(@) = -151 kJ//mol W`.
According to the information, and given the fact that for water, `Delta_(f)H^(@) = -286 kJ//mol` what is the `Delta_(f)H^(@)` for MgO(s)?

A

`-904 "kJ//mole"`

B

`-602"kJ//mole"`

C

`-334"kJ//mole"`

D

`-30"kJ//mole"`

Text Solution

Verified by Experts

The correct Answer is:
B
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