Worksheet: Units of Nuclear Physics: the Unified Atomic Mass Unit

In this worksheet, we will practice converting between kilograms and unified atomic mass units.

Q1:

The mass of one atom of potassium-40 is 39.9640 u. What is the molar mass of potassium-40 in grams per mole?

Q2:

What is 6.47×10 kg in unified atomic mass units? Give your answer to 3 significant figures.

Q3:

What is 3 u in kilograms? Give your answer to 3 significant figures.

  • A4.98×10 kg
  • B1.49×10 kg
  • C1.49×10 kg
  • D4.98×10 kg
  • E1.66×10 kg

Q4:

A platinum-194 atom has a mass of 193.963 u. What is the mass of a platinum-194 atom in kilograms? Give your answer to 6 significant figures.

  • A3.22083×10 kg
  • B3.22083×10 kg
  • C1.93963×10 kg
  • D1.66054×10 kg
  • E1.93963×10 kg

Q5:

Uranium-238 has a molar mass of 238.051 g/mol. What is the mass of one atom of uranium-238 in unified atomic mass units?

Q6:

What is 12.0 µg in unified atomic mass units? Give your answer to 3 significant figures.

  • A7.23×10 u
  • B7.23×10 u
  • C1.38×10 u
  • D1.38×10 u
  • E1.20×10 u

Q7:

A lithium-6 atom has a mass of 6.01512 u. What is the mass of a lithium-6 atom in kilograms? Give an answer that is precise to 6 significant figures.

  • A6.01512×10 kg
  • B1.66054×10 kg
  • C1.00117×10 kg
  • D4.99417×10 kg
  • E9.98835×10 kg

Q8:

A proton has a rest mass of 1.67262×10 kg. What is the rest mass of a proton in unified atomic mass units? Give an answer that is precise to 6 significant figures.

Q9:

A neutron has a rest mass of 1.67492×10 kg. What is the rest mass of a neutron in unified atomic mass units? Give an answer that is precise to 6 significant figures.

Q10:

An electron has a rest mass of 9.10938×10kg. What is the rest mass of an electron in unified atomic mass units? Give an answer that is precise to 6 significant figures.

  • A9.10938 u
  • B1.82289 u
  • C5.48580 u
  • D5.48579×10 u
  • E1.82289×10 u

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