The equation for the reaction of nitrogen and oxygen to form...

The equation for the reaction of nitrogen and oxygen to form nitrogen oxide is written as $(9.2,9.6)$ $$ \mathrm{N}_{2}(g)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{NO}(g) \quad \Delta H=+90.2 \mathrm{~kJ} $$ a. How many kilojoules are required to form $3.00 \mathrm{~g}$ of NO? b. How many grams of NO form when $66.0 \mathrm{~kJ}$ are absorbed?

The equation for the reaction of nitrogen and oxygen to form nitrogen oxide is written as $(9.2,9.6)$
$$
\mathrm{N}_{2}(g)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{NO}(g) \quad \Delta H=+90.2 \mathrm{~kJ}
$$
a. How many kilojoules are required to form $3.00 \mathrm{~g}$ of NO?
b. How many grams of NO form when $66.0 \mathrm{~kJ}$ are absorbed?

Key Concepts

Energy to Mole Conversion

This concept involves using the energy change provided by a reaction (such as the enthalpy change) to determine the amount of reactant consumed or product formed. By relating the energy per mole to the total energy, one can calculate the corresponding amount in moles and then convert this value to mass as necessary.

Molar Mass and Conversion

Molar mass is the mass of one mole of a substance and serves as a bridge between the microscopic world of atoms and molecules and the macroscopic world of grams and liters. It is used to convert between the mass of a substance and the number of moles, which is essential for applying stoichiometric coefficients in chemical equations.

Stoichiometry

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction. It involves using the balanced chemical equation to determine how much of each reactant is needed to produce a desired amount of product, or vice versa, and requires converting between moles, mass, and energy through the use of mole ratios.

Enthalpy Change (?H)

Enthalpy change represents the amount of heat absorbed or released during a chemical reaction at constant pressure. Expressed typically in kilojoules per mole, it provides a connection between the energy involved in forming or breaking bonds and the quantities of reactants or products, making it crucial for calculations in thermochemistry.

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