Which of the following term is unitless -

Question

Question

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Answer 1

CONCEPT:

Unitless Terms in Chemistry

In chemistry, certain quantities are considered unitless because they represent ratios or pure numbers without any associated units.

EXPLANATION:

Among the given options:
- Molality (m) is defined as the number of moles of solute per kilogram of solvent. It has units of moles per kilogram (mol/kg).
- Molarity (M) is defined as the number of moles of solute per liter of solution. It has units of moles per liter (mol/L).
- Mole fraction (χ) is defined as the ratio of the number of moles of a component to the total number of moles of all components in the mixture. It is a ratio and therefore unitless.
- Strength typically refers to concentration and can have various units such as grams per liter (g/L) or moles per liter (mol/L).
Therefore, the only term that is unitless is the mole fraction (χ).

Therefore, the correct answer is Mole fraction.