AP Chem 1.1 Moles and Molar Mass

What is the formula for calculating the number of moles (n) in a sample?

• n = m/M (number of moles = mass of sample/molar mass)

• n = M/m (number of moles = molar mass/mass of sample)

• n = m × M (number of moles = mass of sample × molar mass)

• n = M × m (number of moles = molar mass × mass of sample)

How many particles are in 1 mole?

• 6.02 x 10^23 particles

• 3.01 x 10^24 particles

• 9.11 x 10^20 particles

The particles we deal with in chemistry are:

• Atoms

• Molecules

• Formula units

• All of the above

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

What is the value of Avogadro's number?

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NGSS.HS-PS1-7

A mole (mol) is the amount of a substance that contains ______ representative particles of that substance.

• 9.11 × 10^{-31}

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NGSS.HS-PS1-7

The SI unit for the amount of a substance is called the:

• Mole

• Dozen

• Gross

• Atom

A representative particle is the ______ unit in which a substance naturally exists.

• smallest

• largest

• heaviest

• lightest

What is the molar mass of zinc (Zn)?

• 65.4 g/mol

• 12.0 g/mol

• 24.3 g/mol

• 40.1 g/mol

What is the representative particle for diatomic elements such as H2, N2, O2, F2, Cl2, Br2, and I2?

• Molecule

• Atom

• Ion

• Electron

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NGSS.MS-PS1-1

What is the representative particle for ionic compounds such as NaCl and Ca(NO₃)₂?

• Formula unit

• Molecule

• Atom

• Ion