Atomic Mass Calculation Quiz

What is the atomic mass of Bromine as shown on the periodic table?

• 79.9

• 80.9

• 78.9

• 81.9

Why do elements with isotopes have a single atomic mass listed on the periodic table?

• It is an average based on isotopic abundance.

• It is the mass of the most common isotope.

• It is the mass of the heaviest isotope.

• It is the mass of the lightest isotope.

What does the formula for calculating atomic mass involve?

• Multiplying isotopic fractions by their masses and summing the results.

• Adding the masses of all isotopes.

• Subtracting the lightest isotope's mass from the heaviest.

• Dividing the total mass by the number of isotopes.

How do you convert percent abundance to a fraction for calculations?

• Divide by 100.

• Add 100.

• Subtract from 100.

• Multiply by 100.

What is the atomic mass of H1 used in the example calculation?

• 1.80 AMU

• 1.79 AMU

• 1.78 AMU

• 1.81 AMU

What is the fraction of H1 used in the example calculation?

• 0.9968

• 0.9978

• 0.9988

• 0.9998

What is the atomic mass of H2 used in the example calculation?

• 2.42 AMU

• 2.41 AMU

• 2.44 AMU

• 2.43 AMU

What is the fraction of H2 used in the example calculation?

• 0.000415

• 0.000315

• 0.000215

• 0.000115

What is the calculated atomic mass of hydrogen in the example?

• 1.82 AMU

• 1.79 AMU

• 1.80 AMU

• 1.81 AMU

Why is the calculated atomic mass closer to the mass of H1?

• H1 is less abundant than H2.

• H1 is heavier than H2.

• H1 is more abundant than H2.

• H1 is lighter than H2.