Achieve Textbook 5G.11 (Reaction Quotient)

[gracetran3d]

For this textbook problem, it gives us a few chemical equations and asks us for the reaction quotient, Q. The answer key shows 2 answers as the partial pressure reaction quotient and 1 answer as the concentration. Does it have to be a specific one based on the chemical reaction equation or did the textbook just want to show examples of either or?

[Jonathan Kwon 2J]

It depends on the state of the substances in the chemical equation, so the equations with gases are expressed in partial pressures while equations with aqueous substances are expressed with concentrations.

[Cara W]

For reactions that involve gases, the partial pressures are used and the reaction quotient is Q. For aqueous solutions, the concentrations are used and the reaction quotient is Q_c.

[Vivian_Lau_2D]

Hello. If the reaction is in aqueous state, you would express the reaction quotient (Q) with its molar concentrations. If the reaction is in gas state, you would express the reaction quotient (Q) with its partial pressures. If you're asked to calculate the reaction quotient (Q) when given both molar concentrations and partial pressures, convert the partial pressures to molar concentrations using concentration= (P/RT). Hope this helps!

[Cian Cox 3E]

If the reaction shows the molecules in the reactions are gases you will solve for Qp. Your answer will be partial pressures and use units like barr. If the initial molecules are aqueous than you will solve for Qc and your final answer will be in mols/L.