# 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?

• A 39,964.0 g/mol
• B 39.9640 g/mol
• C 0.0399640 g/mol
• D 39,964,000 g/mol
• E 3.99640 g/mol

Q2:

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

• A 6.47 u
• B 0.0257 u
• C 3.90 u
• D 25.7 u
• E 39.0 u

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?

• A 238.000 u
• B 2.38051 u
• C 238,051 u
• D 238.051 u
• E 0.238051 u

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

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