Nitrogen 14 has a relative abundance of 99.63%. What is the decimal equivalent of that percentage?

A. 99.63
Incorrect. You must divide the percentage by 100.

B. 0.09963
Incorrect. You must divide by 100.

C. 9963.00
Incorrect. You must divide by 100.

D. 0.9963
Correct! You got it right.

Calculate the atomic mass of Gallium (Ga). Gallium has two isotopes: Ga-69 and Ga-71. Ga-69 has a relative abundance of 60.12% and an atomic weight of 68.9257 amu. Ga-71 has a relative abundance of 39.88% and an atomic weight of 70.9249 amu.

A. 70.1 amu
Incorrect. Did you multiply percent times the atomic weight?

B. 69.72 amu
Correct!

C. 68.45 amu
Incorrect. Did you multiply percent times the atomic weight?

D. 6972.00 amu
Incorrect. Did you use the decimal form of percent when you multiplied?

What is the average atomic mass of a sample of Copper given the data table below?

A. 63.55 amu
Correct!

B. 635 amu
Incorrect. Did you multiply the percentage times the atomic weight number?

C. 60.12 amu
Incorrect. Did you multiply percentage times the atomic weight?

D. 0.6343 amu
Incorrect. Did you multiply percentage times the atomic weight?

Calculate the average atomic mass of Silver.

A. 104.9 amu
Incorrect. Did you multiply percentage times the atomic weight?

B. 109.2 amu
Incorrect. Did you multiply percentage times the atomic weight?

C. 102.2 amu
Incorrect. Did you multiply percentage times the atomic weight?

D. 107.96 amu
Correct!