22. A bar of copper has a mass of 216 g and a volume of 24 cm³. Calculate the density of copper?

• [tex] \rm {\green{C.\: 9 \: g/cm {}^{3} }}[/tex]

Solution:

[tex] \rm p = \frac{mass}{volume} [/tex]

[tex] \rm p = \frac{ \green{216 \: grams}}{ \green{24 \: cm {}^{3} }} [/tex]

[tex] \rm p \approx \green{9 \: g/cm}[/tex]

23. Calculate the mass of ethyl alcohol that exactly fills a 200.0 mL graduated cylinder. The density of ethyl alcohol is 0.789 g/mL.

• [tex] \rm {\green{A. \: 157.8 \: g}}[/tex]

Solution:

[tex] \rm m = (density)(volume)[/tex]

[tex] \rm m = ( \green{0.789 \: g/ml})( \green{200.0 \: ml})[/tex]

[tex] \rm m \approx \green{157.8 \: g}[/tex]

24. What is the density of water?

• [tex] \rm {\green{C.\: 1 \: g/cc}}[/tex]

The exact or common measurement for density of water is gram per millimeter (1 g/ml) or 1 gram per cubic centimeter (1 g/cm³).