delta Hrxn = (sum delta H products)-(sum delta H reactants).
Look these values up in a set of tables (one probably is in your text), substitute and solve.
Standars enthalpy
Mg(OH)2 + H2SO4 = MgSO4 + 2 H2O
1 answer
Mg(OH)2 + H2SO4 = MgSO4 + 2 H2O
1 answer