The Physics
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Opus in profectus

The Atomic Nature of Matter

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Practice

practice problem 1

Verify the following claims about the mole.
  1. A mole of dollar bills would make a stack almost 7,000 light years high.
  2. A mole of mini marshmallows would cover the Earth to a depth of about 1 kilometer.
  3. A mole of standard men would weigh about 7 earth masses.
  4. A mole of food calories could feed every person on earth for about 94 million years.
  5. Counting a mole of anything at a rate of one object per second would take about 19 quadrillion years.

solution

Avogadro's number is huge! The Avogadro constant in the International System of Units is an astonishing 6.02 × 1023 objects per mole.

  1. A mole of dollar bills would make a stack almost 7,000 light years high.
  2. A mole of mini marshmallows would cover the Earth to a depth of about 1 kilometer.
  3. A mole of standard men would weigh about 7 earth masses.
  4. A mole of food calories could feed every person on earth for about 94 million years.
  5. Counting a mole of anything at a rate of one object per second would take about 19 quadrillion years.

practice problem 2

Write something else.

solution

Answer it.

practice problem 3

Write something different.

solution

Answer it.

practice problem 4

Write something completely different.

solution

Answer it.