Atomic Mass and Isotope Calculations

The video tutorial explains how to calculate the mass of a single phosphorus atom by dividing its atomic mass by Avogadro's number. It covers the conversion of units from grams to kilograms and discusses how to calculate the mass of a phosphorus-33 isotope. The tutorial emphasizes the importance of using conversion factors to ensure accurate results.

What is the first step in finding the mass of one atom of phosphorus?

• Divide the atomic mass by Avogadro's number

• Add the atomic mass to Avogadro's number

• Multiply the atomic mass by Avogadro's number

• Subtract Avogadro's number from the atomic mass

What is the unit of atomic mass for phosphorus?

• Atoms per mole

• Moles per gram

• Grams per mole

• Kilograms per mole

What happens to the units when you multiply the atomic mass by Avogadro's number?

• They convert to kilograms

• They cancel out to leave grams

• They change to moles

• They remain as grams per mole

What is the result of dividing 30.97 by Avogadro's number?

• 5.14 times 10 to the negative 23rd grams

• 30.97 grams

• 6.02 times 10 to the 23rd grams

• 5.14 times 10 to the negative 26th grams

How can you convert the mass of one atom from grams to kilograms?

• Subtract 1000

• Add 1000

• Divide by 1000

• Multiply by 1000

What is the significance of Avogadro's number in these calculations?

• It is the number of grams in a mole

• It represents the number of atoms in a gram

• It is the number of atoms in a mole

• It is the number of moles in a gram

What is the atomic mass used for when calculating the mass of an isotope?

• It is ignored

• It is replaced by the mass number of the isotope

• It is doubled

• It is halved

If given phosphorus-33, what should replace the average atomic mass in calculations?

• The atomic number

• The mass number 33

• The number of protons

• The number of neutrons

What is the mass of one atom of phosphorus-33 compared to the average atomic mass?

• It is double

• It is slightly less

• It is slightly more

• It is the same

What is the final step in calculating the mass of an isotope of phosphorus?

• Multiply by Avogadro's number

• Add Avogadro's number

• Divide by Avogadro's number

• Subtract Avogadro's number