The alloy is made of 0.4 m3 copper and 710 kg zinc. what is the density of the alloy?

1. Let’s find the mass of a piece of copper 15 cm3, if the weight of 1 cm3 is known:
8.9 g * 15 = 133.5 g.
2. Let us find the mass of 10 cm3 of zinc, knowing the mass of 1 cm3:
7.1 * 10 = 71 g.
3. Find the weight of the alloy by adding the masses of both pieces:
133.5 + 71 = 204.5 g.
4. Find the volume of the alloy by adding the volumes of the pieces:
15 + 10 = 25 cm3.
5. Divide the weight of the alloy by its volume, we get the mass of 1 cm3:
204.5 / 25 = 8.18 g / cm3.
6. Let’s round the result to tenths of a gram:
8.18 = 8.2 g / cm3.
Answer: the mass of 1 cm3 of the alloy is 8.2