Unit 7 Review

Rank the quantities from smallest to largest.

1 smallest >>>>>> largest 5

• 0.5 mol

• dozen

• 4 mol

• 6.02 x 10^23

• 6,000,000,000

Which conversion factor correctly completes the problem?

• 6.02x10^23 Cu atoms

  ---

  1 mol Cu

• 63.546 Cu atoms

  ---

  1 mole Cu

• 1 mol Cu

  ---

  6.02x10^23 Cu atoms

• 1 mol Cu

  ---

  63.546 Cu atoms

Which conversion factor correctly completes the problem?

• 6.02x10^23 CH₄ molecules

  ---

  1 mol CH₄

• 16.043 CH₄ molecules

  ---

  1 mol CH₄

• 1 mol CH₄

  ---

  6.02x10^23 CH₄ molecules

Which conversion factor correctly completes the problem?

• 6.02x10^23 Xe atoms

  ---

  1 mol Xe

• 1 Xe atom

  ---

  6.02x10^23 mol Xe

• 1 mol Xe

  ---

  6.02x10^23 Xe atoms

• 6.02x10^23 mol Xe

  ---

  1 Xe atom

The isotope hydrogen-1 is the standard used for the relative scale of atomic masses.

• True

• False

Answer explanation

Carbon-12 is used as the standard

The mass of an atom of helium-4 is 4 amu. True or False.

• True

• False

The mass of a mole of hydrogen atoms is 1.008 x 10^23 amu.

• True

• False

Answer explanation

The mass of one mole of H is 1.008 grams.

The mass in grams of one mole of any pure substance is called its molar mass.

• True

• False

The atomic masses recorded on the periodic table are weighted averages of the masses of all the naturally occurring isotopes of each element.

• True

• False

The molar mass of any element is numerically equal to its atomic mass from the periodic table.

• True

• False