Calculating Atomic Weight in Chemistry

What is the most common isotope of carbon on Earth?

• Carbon-12

• Carbon-11

• Carbon-13

• Carbon-14

What percentage of carbon on Earth is Carbon-13?

• 1.11%

• 0.89%

• 98.89%

• 2.22%

How is atomic weight defined?

• The sum of the atomic masses of all isotopes

• The average of the atomic masses of the isotopes

• The weighted average of the atomic masses of the isotopes

• The mass of the most common isotope

What is the atomic weight of carbon approximately?

• 12.00

• 12.01

• 13.00

• 13.01

What is the atomic mass of Carbon-12?

• 12 atomic mass units

• 13 atomic mass units

• 14 atomic mass units

• 11 atomic mass units

How many protons does Carbon-12 have?

• 8

• 6

• 5

• 7

How many neutrons does Carbon-13 have?

• 5

• 6

• 7

• 8

What is the approximate mass of a neutron in atomic mass units?

• 1 atomic mass unit

• 2 atomic mass units

• 0.5 atomic mass units

• 1.5 atomic mass units

What is the difference in atomic mass between Carbon-12 and Carbon-13?

• 1.34 atomic mass units

• 1.50 atomic mass units

• 1.00 atomic mass units

• 1.11 atomic mass units

What is the key difference between atomic mass and atomic weight?

• Atomic mass is the mass of an atom, while atomic weight is the weighted average of isotopes

• Atomic mass is the weighted average of isotopes, while atomic weight is the mass of an atom

• Atomic mass and atomic weight are the same

• Atomic mass is always greater than atomic weight