# What is the unit of KC in the reaction 2SO2 O2 ⇔ 2SO3?

## Unit of KC in the reaction 2SO2 O2 ⇔ 2SO3

Equilibrium constant kc is defined as the ratio of the forward reaction rate constant to the reverse reaction rate constant.

## How do you write KC expressions?

Kc units vary based on the concentrations of each reactant and product in the equation. It is also feasible that there are no units for Kc since the top and bottom concentrations cancel each other out. However, in other instances, you would calculate as follows according to the law of mass action:

Kc is calculated as [PRODUCTS]/[REACTANTS].

## Question

The unit of Kc for the below reaction will be

• mol-1.dm3
• mol2 / dm6
• dm3 / mol
• mol / dm3

Solution: unit of KC in the reaction 2SO2 O2 ⇔ 2SO3

When two moles of product and three moles of reactants are combined in this reaction. Finally, you would cancel the top and the bottom of the reaction by subtracting the total power of the bottom from the total power of the top and as a result, one mole of reactant will remain, so the unit of Kc for the reaction 2SO2 O2 ⇔ 2SO3 is [ mol-1 dm3].

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Unit of Kc for PCl5

## Which of the following is used as a catalyst for the following reaction 2so2 o2 ⟶ 2so3?

• V2O5
• Fe
• Pt
• Ni

V 2O5 is utilised as the catalyst in this reaction.

## Which of the following is not determined by Kc?

• The direction of a chemical reaction
• The extent of a chemical reaction
• The equilibrium mixture concentration when the initial concentration of reactants is known
• The catalyst utilised in a chemical reaction

## What are the units for KC constant?

Kc = Equilibrium constant measured in moles per litre.

Does KC have any units?

Kc and Kp do not have units on their own.

Does KC depend on temperature?

The value of Kc either increases or decreases with temperature, depending on whether the process is endothermic or exothermic.

2SO2 + O2 ⇔ 2SO3

• 400 oC
• 500 oC
• 450 oC
• 600 oC

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