Barium Atom Mass Calculations

The video tutorial explains how to calculate the mass of a single barium atom by dividing its molar mass by Avogadro's number. The process involves using the atomic mass of barium, 137.33 grams per mole, and converting the result to grams and kilograms. The tutorial also covers how to adjust the calculation for the isotope barium-138. The video concludes with a summary of the steps and results.

What is the first step in finding the mass of a barium atom?

• Divide the molar mass by Avogadro's number.

• Multiply the atomic mass by Avogadro's number.

• Add the atomic mass to Avogadro's number.

• Subtract Avogadro's number from the atomic mass.

What is the unit of the atomic mass of barium used in the calculation?

• Moles per gram

• Grams per mole

• Atoms per mole

• Kilograms per mole

Why do the moles cancel out during the conversion process?

• Because they are in both the numerator and the denominator.

• Because they are on opposite sides of the equation.

• Because they are both in the numerator.

• Because they are on the same side of the equation.

What is the mass of one barium atom in grams?

• 2.28 x 10^-25 grams

• 2.28 x 10^-22 grams

• 1.37 x 10^-22 grams

• 1.37 x 10^-25 grams

How do you convert the mass of a barium atom from grams to kilograms?

• Add 1000

• Multiply by 1000

• Subtract 1000

• Divide by 1000

What is the mass of one barium atom in kilograms?

• 2.28 x 10^-25 kg

• 1.37 x 10^-22 kg

• 2.28 x 10^-22 kg

• 1.37 x 10^-25 kg

How would you calculate the mass of a barium-138 isotope?

• Subtract 1 from the atomic mass.

• Use 137 in the calculation instead of 138.

• Use 138 in the calculation instead of 137.

• Add 1 to the atomic mass.

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

• It represents the number of atoms in a gram.

• It represents the number of atoms in a mole.

• It represents the number of moles in a gram.

• It represents the number of grams in a mole.