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Selectivity Formula

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Selectivity of a reaction is the ratio of the desired product formed (in moles) to the undesired product formed (in moles). Check FAQs

S = (\frac{M Desired}{M Undesired}) \cdot 100

S - Selectivity?M_Desired - Moles of Desired Product?M_Undesired - Moles of Undesired Product formed?

Selectivity Example

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With units

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Here is how the Selectivity equation looks like with Values.

Here is how the Selectivity equation looks like with Units.

Here is how the Selectivity equation looks like.

57.5 = (\frac{23}{40}) \cdot 100

57.5 = (\frac{23mol}{40mol}) \cdot 100

57.5 = (\frac{23}{40}) \cdot 100

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Selectivity Solution

Follow our step by step solution on how to calculate Selectivity?

FIRST Step Consider the formula

S = (\frac{M Desired}{M Undesired}) \cdot 100

Next Step Substitute values of Variables

∴

S = (\frac{23mol}{40mol}) \cdot 100

Next Step Prepare to Evaluate

∴

S = (\frac{23}{40}) \cdot 100

LAST Step Evaluate

∴

S = 57.5

Selectivity Formula Elements

Variables

Selectivity

Selectivity of a reaction is the ratio of the desired product formed (in moles) to the undesired product formed (in moles).

Symbol: S

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Selectivity

Moles of Desired Product

Moles of Desired Product tells about the total moles of desired product formed.

Symbol: M_Desired

Measurement: Amount of SubstanceUnit: mol

Note: Value should be greater than 0.

Formulas to find Moles of Desired Product

Moles of Undesired Product formed

Moles of Undesired Product formed tells about the total moles of undesired product formed.

Symbol: M_Undesired

Measurement: Amount of SubstanceUnit: mol

Note: Value should be greater than 0.

Formulas to find Moles of Undesired Product formed

Other formulas in Basic Formulas category

Go Change in Number of Moles due to Reaction

Δn = (v i \cdot ξ Reaction)

Go Extent of Reaction given Change in Number of Moles

ξ Reaction = (\frac{Δn}{v i})

Go Extent of Reaction given Number of Moles Initially and at Equilibrium

ξ Reaction = (\frac{n Equilibrium - n initial}{v i})

Go Number of Moles Initially given Extent of Reaction

n initial = (n Equilibrium - (v i \cdot ξ Reaction))

How to Evaluate Selectivity?

Selectivity evaluator uses Selectivity = (Moles of Desired Product/Moles of Undesired Product formed)*100 to evaluate the Selectivity, The Selectivity formula is defined as ratio of the desired product formed (in moles) to the undesired product formed (in moles). Selectivity is denoted by S symbol.

How to evaluate Selectivity using this online evaluator? To use this online evaluator for Selectivity, enter Moles of Desired Product (M_Desired) & Moles of Undesired Product formed (M_Undesired) and hit the calculate button.

FAQs on Selectivity

What is the formula to find Selectivity?

The formula of Selectivity is expressed as Selectivity = (Moles of Desired Product/Moles of Undesired Product formed)*100. Here is an example- 57.5 = (23/40)*100.

How to calculate Selectivity?

With Moles of Desired Product (M_Desired) & Moles of Undesired Product formed (M_Undesired) we can find Selectivity using the formula - Selectivity = (Moles of Desired Product/Moles of Undesired Product formed)*100.

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Selectivity Formula

Selectivity Example

Selectivity Solution

Selectivity Formula Elements

Other formulas in Basic Formulas category

How to Evaluate Selectivity?

FAQs on Selectivity

Variable Name