Potassium Atomic Mass Concepts

The video tutorial explains how to calculate the mass of a potassium atom by using its atomic mass and Avogadro's number. It demonstrates the conversion of atomic mass to grams and further to kilograms. The tutorial also covers how to calculate the mass of specific isotopes, such as Potassium-40, by substituting the mass number in the calculation.

What is the primary focus when calculating the mass of a potassium atom?

• Measuring the atomic radius

• Calculating the molar mass

• Determining the number of protons

• Finding the electron configuration

What is the atomic mass of potassium as mentioned in the video?

• 41.00

• 38.00

• 40.00

• 39.10

How is the atomic mass of potassium expressed in terms of units?

• Kilograms per mole

• Atoms per mole

• Grams per mole

• Moles per gram

What is the result of dividing the atomic mass of potassium by Avogadro's number?

• 6.48 times 10 to the negative 22nd grams

• 6.48 times 10 to the negative 20th grams

• 6.48 times 10 to the negative 23rd grams

• 6.48 times 10 to the negative 25th grams

Why is the mass of a potassium atom so small?

• Because atoms are large

• Because atoms are small

• Because potassium is a liquid

• Because potassium is a gas

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

• Divide by 1000

• Subtract 1000

• Multiply by 1000

• Add 1000

What is the mass of a potassium atom in kilograms?

• 6.48 times 10 to the negative 20th kilograms

• 6.48 times 10 to the negative 26th kilograms

• 6.48 times 10 to the negative 23rd kilograms

• 6.48 times 10 to the negative 25th kilograms

How would you calculate the mass of a specific isotope like potassium-40?

• Use the atomic number instead of the mass number

• Use the mass number of the isotope in the calculation

• Use the number of electrons in the calculation

• Use the number of neutrons in the calculation

What mass number would you use for potassium-40 in calculations?

• 41

• 38

• 40

• 39.10