Chapter 3 chem

What is the mass of 1 atom of carbon-12 (12C) in atomic mass units (amu)?

• 12 amu

• 1 amu

• 6 amu

• 24 amu

What is the mass of 1 hydrogen atom (H) in atomic mass units (amu)?

• 1.008 amu

• 12.000 amu

• 0.500 amu

• 16.000 amu

What is the mass of 160 hydrogen atoms (H) in atomic mass units (amu)?

• 161.28 amu

• 80.64 amu

• 1.60 amu

• 1600 amu

Atomic mass is the mass of an atom in atomic mass units (amu).

• True

• False

What is the average atomic mass?

• The sum of all isotopes

• The weighted average of all of the naturally occurring isotopes of the element

• The mass of the most common isotope

• The atomic number

What is the atomic number of carbon as shown in the diagram?

• 6

• 8

• 12

• 14

What is the atomic mass of carbon as shown in the diagram?

• 12.01

• 14.00

• 10.00

• 16.00

According to the pie chart, what percentage of carbon is 12C?

• 1.10%

• 12.01%

• 98.90%

• 6%

According to the pie chart, what percentage of carbon is 13C?

• 98.90%

• 1.10%

• 12.01%

• 6%

Copper, a metal known since ancient times, is used in electrical cables and pennies, among other things. The atomic masses of its two stable isotopes, 63/29Cu (69.09 percent) and 65/29Cu (30.91 percent), are 62.93 amu and 64.9278 amu, respectively. Calculate the average atomic mass of copper. The relative abundances are given in parentheses. What is the average atomic mass of copper?

• 63.55 amu

• 62.93 amu

• 64.93 amu

• 65.00 amu