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Meaning & use

molar amount

noun·Academictechnicalchemistry

Last updated

UK/ˈməʊ.lə əˈmaʊnt/
US/ˈmoʊ.lɚ əˈmaʊnt/

Meanings

  1. nouncountabletechnicalchemistry

    The quantity of a substance measured in moles, found by dividing its mass by its molar mass.

    Grammar: Countable and usually used with 'the' or 'a': the molar amount of water in the sample.

    Patterns

    • the molar amount of something
    • calculate the molar amount of something
    • molar amount in moles

    To find the molar amount of sodium chloride, divide 58.5 grams by its molar mass.

    The molar amount of gas doubled when the pressure was halved at constant temperature.

    Students recorded the molar amount of each reactant before the experiment began.

  2. nouncountabletechnicalchemistry

    The number of moles of particles present in a sample, used in calculations about reactions.

    Grammar: Often appears in the pattern 'the molar amount of X is ...', with a number or formula following.

    Patterns

    • the molar amount of something is ...
    • express something as a molar amount

    The molar amount of carbon dioxide produced tells us how much acid reacted.

    Write the molar amount of each ion in the final solution.

Word forms

pluralmolar amounts

Common combinations

calculate the molar amount
You can calculate the molar amount from the mass and the molar mass.
the molar amount of a substance
The molar amount of a substance is measured in moles.
molar amount in moles
Report the molar amount in moles, not in grams.
determine the molar amount
Chemists determine the molar amount before balancing the equation.

Synonyms and how they differ

amount in moles
A plain, non-technical way to say the same thing; use it when writing for a general reader.
quantity of substance
Broader and less precise, since it does not say the measurement is in moles.

Word family

mole noun
The unit itself: the amount of a substance containing a fixed number of particles.
molar mass noun
The mass of one mole of a substance, used to convert mass into molar amount.
molarity noun
The concentration of a solution measured in moles per liter.

Commonly confused: molar amount or molar mass?

molar amount vs molar mass

Molar mass is a mass in grams per mole; molar amount is a number of moles. You divide mass by molar mass to get the molar amount.

Practice

A student has 36 g of water (molar mass 18 g/mol). What is the molar amount?

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