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Question

Which of the following variables are needed to calculate molarity?


A
weight of solvent
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B

temperature

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C

No. of moles

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D

none

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Solution

The correct option is C

No. of moles


Avogadro's constant will be required if a question gives you the number of particles / ions etc., of the solute to calculate number of moles.

Gas constant may be required if the temperature and pressure conditions of a gas are provided to calculate the volume and use that to calculate number of moles in case the gas is later used as a solute.

Number of moles and volume of solution are obviously required.

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