Posted by **Perrie** on Monday, July 8, 2013 at 5:50am.

1. A piece of rectangular wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water?

2. I threw a plastic ball in the pool for my dog to fetch. The mass of the ball was 125g. What must the volume be to have a density of 0.500 g/mL?

- Chemistry -
**Jai**, Monday, July 8, 2013 at 6:50am
#1.

Recall that the density of a material is just

d = m/V

where:

m = mass

V = volume

Also, the volume of a rectangular solid is given by

V = l*w*h

where:

l = length

w = width

h = height

Substituting,

d = 80 / (3*6*4)

d = 80 / 72

d = 1.11 g / cm^3

No, it will NOT float because the density of wood is greater than density of water (which is approximately 1 g /cm^3 at standard temperature & pressure)

#2.

d = m/V

V = m/d

V = 125 / 0.5

V = 250 mL

Hope this helps~ :)

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