# 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 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.

• A kg
• B kg
• C kg
• D kg
• E 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.

• A kg
• B kg
• C kg
• D kg
• E 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.

• A u
• B u
• C u
• D u
• E 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.

• A kg
• B kg
• C kg
• D kg
• E kg

Q8:

A proton has a rest mass of 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 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 . 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
• D u
• E u