# Density of an alloyWatch

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#1
I have the masses of two metals, the density of them both, but I'm asked to find the density of the alloy. I know denstiy=Mass/volume

It's a 4 mark question and I don't get what values for masses and volume I should be putting in.
0
2 years ago
#2
Are you sure that the question contains no information about the proportion of the metals in the alloy?
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#3
(Original post by AHappyStudent)
Are you sure that the question contains no information about the proportion of the metals in the alloy?
"180g of copper mixed with 105g of zinc to make an alloy

Density of copper is 9 g/cm^3
Density of zinc is 7 g/cm^3

What is the density of the alloy?"

Thanks
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2 years ago
#4
So for both elements, divide the mass by the density to obtain the volume of each. Adding these volumes will give you the total volume of the alloy. Then divide the sum of the masses by this total volume to obtain the density of the alloy (I think)
2
#5
(Original post by AHappyStudent)
So for both elements, divide the mass by the density to obtain the volume of each. Adding these volumes will give you the total volume of the alloy. Then divide the sum of the masses by this total volume to obtain the density of the alloy (I think)
Thanks!
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