Atomic Mass and Isotopes of Oxygen

The video tutorial explains how to find the mass of one atom of oxygen using the average atomic mass and Avogadro's number. It details the calculation process, including converting units from grams to kilograms. The tutorial also covers how to adjust the calculation for isotopes, such as oxygen-18, and concludes with a brief summary of the results.

What is the significance of the average atomic mass in finding the mass of an oxygen atom?

• It provides the atomic number.

• It is used to calculate the molar mass.

• It indicates the number of neutrons.

• It helps in determining the number of protons.

How do you calculate the mass of one atom of oxygen?

• Subtract Avogadro's number from the atomic mass.

• Add the atomic mass to Avogadro's number.

• Divide the atomic mass by Avogadro's number.

• Multiply the atomic mass by Avogadro's number.

What is the unit of the average atomic mass of oxygen?

• Atoms per mole

• Grams per atom

• Kilograms per mole

• Grams per mole

Why do the units of moles cancel out during the conversion process?

• Because they are not needed in the calculation.

• Because they are multiplied by zero.

• Because they are added to the grams.

• Because they are on both the numerator and denominator.

What is the mass of one oxygen atom in grams?

• 4.66 x 10^-23 grams

• 3.66 x 10^-23 grams

• 1.66 x 10^-23 grams

• 2.66 x 10^-23 grams

How can the mass of an oxygen atom be expressed in kilograms?

• By subtracting 1000

• By adding 1000

• By dividing by 1000

• By multiplying by 1000

What changes when calculating the mass of an oxygen-18 isotope?

• The number of protons is used.

• The atomic number is used instead of the atomic mass.

• Avogadro's number is changed.

• The atomic mass is replaced with 18.

What is the atomic mass used for oxygen-18 in calculations?

• 18.00

• 14.00

• 20.00

• 16.00

Who is the presenter of the video tutorial?

• Dr. C

• Dr. B

• Dr. A

• Dr. D