Chemistry H.W help…?
1- A brick used in construction of pottery kilns is 11.0 cm wide,6.0 cm tall, and 22.7 cm long. The brick has a mass of 2950 g. What is the density of the brick..
2- The density of copper is 8.96 g/(cm)3 . If a rectangular sheet of copper is 10.3 cm wide, 46.1 cm long, and 0.14 cm thick,what is the mass of the copper.
I have no idea how to find the answer…
1.
d = m / V
V = l x w x h = 22.7 cm x 11.0 cm x 6.0 cm = 1498.2 cm^3
(1498.2 cm^3 rounds to 1.5 x 10^3 cm^3 to 2 sig figs)
d = m / V = 2950 g / 1.5 x 10^3 cm^3 = 1.97 g/cm^3
(1.97 g/cm^3 rounds to 2.0 g/cm^3 to 2 sig figs)
2.
V = l x w x h = 46.1 cm x 10.3 cm x 0.14 cm = 66 cm^3 (2 sig figs)
d = m / V
m = d x V = 8.96 g/cm^3 x 66 cm^3 = 590 g (2 sig figs)
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