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Chapter 5: Problem 55

Define Dalton's law of partial pressures and mole fraction. Does mole fraction have units?

Short Answer

Expert verified
Dalton's Law states that the total pressure of a mixture of gases is the sum of the pressures of each of the individual gases. Mole fraction indicates the concentration of a component in a mixture and is calculated by dividing the number of moles of a component by the total number of moles. Mole fraction has no units as it is a ratio of quantities of the same unit - moles.

Step by step solution

01

Define Dalton's Law

Dalton's Law, also known as the law of partial pressures, states that the total pressure of a mixture of gases is equal to the sum of the pressures of each of the different gases making up the mixture. Each of these pressures is referred to as a partial pressure and it is defined as the pressure that each gas would exert if it alone occupied the entire volume of the mixture.
02

Define Mole Fraction

The mole fraction is a way of expressing the concentration of a component in a mixture. It is defined as the ratio of the number of moles of a particular component to the total number of moles of all components in the mixture.
03

Does Mole Fraction Have Units?

Since mole fraction is a ratio of quantities of the same unit (moles), it is dimensionless and therefore has no units. It is simply a ratio and does not have any accompanying units.

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