Stoichiometry

ChemistryIntermediate Level

10 flashcards

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Question

How do you calculate the number of moles in a given mass of a substance?

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Answer

Definition

To calculate the number of moles, divide the mass of the substance by its molar mass.

Example

If you have 18 grams of water (H2O), and the molar mass is 18 g/mol, then you have 1 mole of water.

Quick Tip

Moles = mass / molar mass

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