The standard enthalpies of formation of Al_(2)O_(3) and CaO are -1675 kJ mol^(-1) and -635 kJ mol^(-1) respectively.For the reaction3CaO + 2Al -> 3Ca + Al_(2)O_(3) the standard reaction enthalpy Delta_(r)H^(0) = _________ kJ.(Round off to the Nearest Integer)

The standard enthalpies of formation of Al2O3 and CaO a... | null (Chemistry) | DivineJEE

Exam

Chemistry

The standard enthalpies of formation of Al₂O₃ and CaO are

-

1675 kJ mol^-1 and

-

635 kJ mol^{$-$ 1} respectively.

For the reaction

3CaO + 2Al

\to

3Ca + Al₂O₃ the standard reaction enthalpy

\Delta

_rH⁰ = _________ kJ.

(Round off to the Nearest Integer)

Correct Answer:

230

3CaO + 2Al\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{}} 3Ca + A{l_2}{O_3}

\Delta H_{reaction}^o = 3\Delta {H^o}_f(Ca,s) + \Delta {H^o}_f(A{l_2}{O_3},s) - 3\Delta {H^o}_f(CaO,s) - 2\Delta {H^o}_f(Al,S)

= 0 + ( - 1675) - 3( - 635) - 0

= - 1675 + 1905

= 230

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