Ch. 10.1 - The Mole: A Measurement of Matter

Ch. 10.1

The Mole: A Measurement of Matter

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If 0.20 bushel is 1 dozen apples and a dozen apples has a mass of 2.0 kg, what is the mass of 0.50 bushel of apples?

=

kg

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How many moles if 2.17x10²³ representative particles of bromine?

(round to 3 sig figs)

=

mol Br

Multiple Choice

True or False? A mole of a pure substance contains 6.02 x 10²³ representative particles.

• True

• False

Multiple Choice

True or False? The representative particle of any compound is the molecule.

• True

• False

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How many moles of Pb is 9.3 x 10¹⁵ atoms of Pb?

(round to 2 sig figs)

=

x 10^-8 mol Pb

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How many atoms are in 1.14 mol SO₃?

(round to 3 sig figs)

=

x 10²⁴ atoms

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How many representative particles are in 2.5 mol of H₂O₂?

(round to 2 sig figs)

=

x 10²⁴ molecules H₂O₂

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Find the molar mass of PCl₃. Round to the tenth's place.

(that is phosphorus trichloride, not phosphorus carbon and iodine)

=

g/mol

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What is the molar mass of ethane, C₂H₆? Round to the nearest whole number.

=

g/mol

Fill in the Blanks

Calculate the molar mass of ammonium nitrate. Round to the nearest whole number.

(Hint: You will first need to write out the chemical formula for ammonium nitrate)

=

g/mol