Chem Chapter 10 - Molar Mass

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16 Terms

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Mole

A counting unit that equals 6.02 × 10²³ particles

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Avogadro’s number

6.02 × 10²³ particles per mole

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Molar mass

Mass of 1 mole of a substance (in grams)

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Moles to particles

Multiply moles by 6.02 × 10²³

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Particles to moles

Divide particles by 6.02 × 10²³

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Mass to moles

Divide grams by molar mass

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Moles to mass

Multiply moles by molar mass

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STP

Standard Temperature and Pressure (0°C and 1 atm)

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Molar volume at STP

1 mole of gas = 22.4 liters at STP

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Percent composition

(Part / Whole) × 100

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Empirical formula

Simplest whole

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Molecular formula

Actual number of atoms in a molecule

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Finding empirical formula

Convert grams to moles, divide by smallest, round to whole numbers

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Finding molecular formula

Divide molar mass by empirical mass, multiply subscripts

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Representative particles

Atoms, molecules, or formula units

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Density of a gas

Mass ÷ Volume (usually in g/L at STP