Calcium oxide (quicklime) reacts with water to produce...

Calcium oxide (quicklime) reacts with water to produce calcium hydroxide (slaked lime). $$ \mathrm{CaO}(s)+\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}(s) ; \Delta H=-65.2 \mathrm{~kJ} $$ The heat released by this reaction is sufficient to ignite paper. How much heat is released when $28.6 \mathrm{~g}$ of calcium oxide reacts?

Calcium oxide (quicklime) reacts with water to produce calcium hydroxide (slaked lime).
$$
\mathrm{CaO}(s)+\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}(s) ; \Delta H=-65.2 \mathrm{~kJ}
$$
The heat released by this reaction is sufficient to ignite paper. How much heat is released when $28.6 \mathrm{~g}$ of calcium oxide reacts?

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Key Concepts

Stoichiometry

Stoichiometry involves calculating the relative quantities of reactants and products in chemical reactions based on balanced chemical equations. It allows chemists to convert between masses, moles, and molecules using mole ratios derived from the reaction's coefficients.

Molar Mass

Molar mass is a property of a substance that expresses the mass of one mole of its molecules or atoms, typically in grams per mole. It is a crucial factor in converting between mass and number of moles, which is essential for stoichiometric calculations.

Enthalpy Change

Enthalpy change (?H) represents the heat absorbed or released during a chemical reaction at constant pressure. It is a core concept in thermochemistry that helps determine whether a reaction is endothermic or exothermic.

Exothermic Reaction

An exothermic reaction is one that releases heat into its surroundings. This energy release can cause a rise in temperature and may lead to observable phenomena such as ignition, depending on the magnitude of the heat released.

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