1. Density

2. - Amount of mass in a given volume
grams
Formula
Calculate the density of an object that has a mass of 25.0 g and a volume of 4.7 mL.
Given info:
m =
v =
d =
mL or cm3
g/mL or g/cm3
(3)
25.0 g
4.7 mL
(2)
? g/mL
5.319 becomes 5.3 (2)

3. Calculate the mass of 20.0 cm3 of gold at a density of 19.3 g/cm3.
Given info: m = ? g v = 20.0 cm3 d = 19.3 g/cm3
Do the algebra to solve for mass.
m = vd
m = (20.0 cm3)(19.3 g/cm3)
m = 386 or 390 g with 2 sig figs

4. Determine the volume of air, in mL, in a balloon that has a mass of 6
Determine the volume of air, in mL, in a balloon that has a mass of 6.73 g and a density of 1.32 g/L.
Given info
m = g
v = ? mL
d = 1.32 g/L x
Do the algebra to solve for volume.
V = 5.10 x 103 mL
The you get needs to be round off to show 3 sig figs is only 2 sig figs therefore I wrote the answer in sci not.
Must convert the L into mL. Remember since the L is on the bottom L has to go on top of the next step.