A 450^∘ C, colocam-se 3,60 moles de amônia num balão de 2,00 L e se espera até que haja a decom

Step 1: Calcular a concentração inicial de amônia (NH₃) no balão. A concentração (C) é dada pe

A 450^∘ C, colocam-se 3,60 moles de amônia num balão de 2,00...

A $450^{\circ} \mathrm{C}$, colocam-se 3,60 moles de amônia num balão de $2,00 \mathrm{~L}$ e se espera até que haja a decomposição do gás nos seus elementos. $$ 2 \mathrm{NH}_3(\mathrm{~g}) \rightleftarrows \mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g}) $$ Se o valor experimental da $K$, desta reaçao for 6,3 , na temperatura mencionada, calcule a concentração de cada reagente no sistema em equilibrio. Qual a pressāo total no balão?

A $450^{\circ} \mathrm{C}$, colocam-se 3,60 moles de amônia num balão de $2,00 \mathrm{~L}$ e se espera até que haja a decomposição do gás nos seus elementos.
$$
2 \mathrm{NH}_3(\mathrm{~g}) \rightleftarrows \mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g})
$$

Se o valor experimental da $K$, desta reaçao for 6,3 , na temperatura mencionada, calcule a concentração de cada reagente no sistema em equilibrio. Qual a pressāo total no balão?

Key Concepts

Chemical Equilibrium

Chemical equilibrium refers to the state of a reversible reaction where the rate of the forward reaction equals the rate of the reverse reaction, resulting in constant concentrations of both reactants and products over time. It is a dynamic process where reactions continue to occur even though macroscopic properties remain unchanged.

Equilibrium Constant (K)

The equilibrium constant, K, quantifies the ratio of the concentrations (or partial pressures) of products to reactants at equilibrium, with each concentration raised to the power of its stoichiometric coefficient. This constant is temperature-dependent and provides insight into the extent to which a reaction proceeds toward products or remains with reactants.

Reaction Stoichiometry

Reaction stoichiometry involves the quantitative relationships between reactants and products in a chemical reaction. It is essential for determining how the amounts of all species change as the system approaches equilibrium, and it forms the basis for setting up the relationships used in equilibrium calculations.

ICE Table

An ICE (Initial, Change, Equilibrium) table is a systematic method for organizing and calculating the initial amounts, changes during the reaction, and final equilibrium amounts of all species involved. It facilitates solving equilibrium problems by clearly displaying the connections between reaction stoichiometry and concentration or pressure changes.

Ideal Gas Law

The ideal gas law, expressed as PV = nRT, relates the pressure, volume, number of moles, and temperature of a gas. In the context of gas-phase equilibrium reactions, it is used to convert between the number of moles (or molarity) and partial pressures, enabling the calculation of total pressure from equilibrium concentrations.

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