Calculations Involving the Equilibrium Constant (AQA A-Level Chemistry): Quizzes

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Calculations Involving the Equilibrium Constant
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What do KcK_c calculations help predict?

Position of equilibrium

What determines the units of KcK_c?

The reaction's stoichiometry

What is the first step in calculating KcK_c?

Write the balanced equation

For PCl5(g)⇌PCl3(g)+Cl2(g)PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g), what is the KcK_c expression?

Kc=[PCl3][Cl2][PCl5]K_c = \frac{[PCl_3][Cl_2]}{[PCl_5]}

If 2.00 mol PCl5PCl_5 initially and 1.20 mol Cl2Cl_2 at equilibrium, find mol PCl5PCl_5 at equilibrium.

0.80 moles

In the example, how many moles of PCl3PCl_3 form at equilibrium?

1.20 moles

Calculate [PCl5][PCl_5] if 0.80 mol in 20 dm3dm^3.

0.04 mol dm−3^{-3}

How to convert moles to concentration?

Divide moles by volume in dm3dm^3

If [PCl3]=0.06[PCl_3]=0.06, [Cl2]=0.06[Cl_2]=0.06, [PCl5]=0.04[PCl_5]=0.04 mol dm−3^{-3}, find KcK_c.

0.09 mol dm−3^{-3}

In the example, what are the units of KcK_c?

mol dm−3^{-3}

Explore AQA A-Level Chemistry Revision Notes by Topics

Atomic Structure

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The Mole, Avogadro & The Ideal Gas Equation

Types of Bonding & Properties

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Kinetics

Chemical Equilibria, Le Chatelier's Principle & Kc

Oxidation, Reduction & Redox Equations

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Oxidation, Reduction & Redox Equations

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Atomic Structure

Formulae, Equations & Calculations

The Mole, Avogadro & The Ideal Gas Equation

Types of Bonding & Properties

Molecules: Shapes & Forces

Energetics

Kinetics

Chemical Equilibria, Le Chatelier's Principle & Kc

Oxidation, Reduction & Redox Equations

Show more

Oxidation, Reduction & Redox Equations

Explore AQA A-Level Chemistry Flashcards by Topics

Atomic Structure

Formulae, Equations & Calculations

The Mole, Avogadro & The Ideal Gas Equation

Types of Bonding & Properties

Molecules: Shapes & Forces

Energetics

Kinetics

Chemical Equilibria, Le Chatelier's Principle & Kc

Oxidation, Reduction & Redox Equations

Show more

Oxidation, Reduction & Redox Equations

Explore AQA A-Level Chemistry Exam Questions by Topics

Atomic Structure

Formulae, Equations & Calculations

The Mole, Avogadro & The Ideal Gas Equation

Types of Bonding & Properties

Molecules: Shapes & Forces

Energetics

Kinetics

Chemical Equilibria, Le Chatelier's Principle & Kc

Oxidation, Reduction & Redox Equations

Show more

Oxidation, Reduction & Redox Equations

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