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(Solved): The reaction of sodium peroxide and water can be used as a source of \( \mathrm{O}_{2}(\mathrm{~g} ...
The reaction of sodium peroxide and water can be used as a source of \( \mathrm{O}_{2}(\mathrm{~g}) \). \[ 2 \mathrm{Na}_{2} \mathrm{O}_{2}(\mathrm{~s})+2 \mathrm{H}_{2} \mathrm{O}(\ell) \rightarrow 4 \mathrm{NaOH}(\mathrm{aq})+\mathrm{O}_{2}(\mathrm{~g}) \quad \Delta H=-287 \mathrm{~kJ} \mathrm{~mol}^{-1} \mathrm{How} \] many kJ of heat are evolved in the reaction of \( 226 \mathrm{~g} \mathrm{Na}_{2} \mathrm{O}_{2} \) with \( 98.5 \mathrm{~g} \mathrm{H}_{2} \mathrm{O} \) ?
Expert Answer
The given thermochemical reaction is Note that the enthalpy change of the reaction is negative. By convention, negative enthalpy change corresponds to an exothermic reaction. Hence, 2 m