Sulfur trioxide decomposes to sulfur and oxygen. (7.6, 7.7,7.9) 2 SO3(g) ⟶2 S(s)+3 O2(g

step 1 All right, so we have here a balanced thermochemical equation. For part A, we want to know if it

Sulfur trioxide decomposes to sulfur and oxygen. (7.6, ...

Sulfur trioxide decomposes to sulfur and oxygen. (7.6, $$\begin{aligned}&7.7,7.9) \\ &2 \mathrm{SO}_{3}(g) \longrightarrow 2 \mathrm{~S}(s)+3 \mathrm{O}_{2}(g) \quad \Delta H=+790 \mathrm{~kJ} \end{aligned}$$ a. Is the reaction endothermic or exothermic? b. How many kilojoules are required when $1.5$ moles of $\mathrm{SO}_{3}$ reacts? c. How many kilojoules are required when $150 \mathrm{~g}$ of $\mathrm{O}_{2}$ is formed?

Sulfur trioxide decomposes to sulfur and oxygen. (7.6,
$$\begin{aligned}&7.7,7.9) \\
&2 \mathrm{SO}_{3}(g) \longrightarrow 2 \mathrm{~S}(s)+3 \mathrm{O}_{2}(g) \quad \Delta H=+790 \mathrm{~kJ}
\end{aligned}$$
a. Is the reaction endothermic or exothermic?
b. How many kilojoules are required when $1.5$ moles of $\mathrm{SO}_{3}$ reacts?
c. How many kilojoules are required when $150 \mathrm{~g}$ of $\mathrm{O}_{2}$ is formed?

Key Concepts

Reaction Enthalpy

Reaction enthalpy is the energy change occurring during a chemical reaction, quantified by the change in enthalpy (?H). It indicates whether energy is absorbed or released, providing insight into the heat flow of the reaction under constant pressure conditions.

Endothermic vs Exothermic Reactions

This concept distinguishes reactions based on their heat exchange with the surroundings. Endothermic reactions absorb energy (characterized by a positive ?H), while exothermic reactions release energy (indicated by a negative ?H). Recognizing this helps predict how reactions impact the energy balance of the system.

Chemical Stoichiometry

Chemical stoichiometry involves using a balanced chemical equation to determine the quantitative relationships between reactants and products. It allows one to calculate the number of moles, mass, or volume of substances required or produced in a reaction through their stoichiometric coefficients.

Molar Conversions

Molar conversions are essential for translating between mass, number of moles, and particle count, typically using the substance's molar mass and Avogadro's number. These conversions are key in applying stoichiometric relationships to real-world quantities in chemical reactions.

Proportional Reasoning in Thermochemical Calculations

This concept involves scaling the energy changes provided by a balanced equation to the specific amounts of reactants or products used in the reaction. It ensures that the calculations for enthalpy change are accurately proportioned to the actual quantities involved.

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