Question

Enthalpy is an extensive property i.e. it depends on the amount of reactants.

if the amount of reactants double, as in the above reaction, the enthalpy will also double. Therefore, standard enthalpy for

4Mn + 3O22Mn2O3 will be -1942kJ

Enthalpy is also a state function so the standard enthapy for the reaction

Be(s) + O2(g) + H2 (g) Be(OH)2 (s) will be -903kJ

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