A piece of PVC pipe displaces 60 mL when placed in a container of water. If the pipe has a mass of 78 g, what is its density?

1 Answer
Meave60
May 27, 2018

Refer to the explanation.

Explanation:

#"density"=("mass")/("volume")#

The #"60 mL"# of displaced water is the volume of the PVC pipe. Since the PVC pipe is a solid, we can use the equality #"1 mL"##=##"1 cm"^3"# to convert #"60 mL"# to #"60 cm"^3"#.

#60color(red)cancel(color(black)(1"mL"))xx("1 cm"^3)/(1color(red)cancel(color(black)("mL")))="60 cm"^3"#

#"density of PVC pipe"=("78 g")/("60 cm"^3)="1.3 g/cm"^3"#, which should be rounded to #"1 g/cm"^3"# which has one significant figure because #"60 mL"# has one significant figure.

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