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Brass is an alloy of copper and zinc Varying the mass percentages of the two metals produces brasses with different
properties. A brass called yellow zinc has high ductility and strength and is 34%-37% zinc by mass, (a) Find the mass range (in g) of copper in 185 g of yellow zinc, (b) What is the mass range (in g) of zinc in a sample of yellow zinc that contains 46_5 g of copper?

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JannetPalos

Answer:Mass range of Cu in yellow zinc is 116.6-122.1 g

Mass range of Zn in yellow zinc is 15.81-17.205 g

Explanation:

(a) 100 g of yellow zinc contains maximum of  (100-34) g or 66 g of Cu and minimum of (100-37) g or 63 g of Cu

So 185 g of yellow zinc contains maximum of [tex]\frac{66\times 185}{100}g[/tex] or 122.1 g of Cu and minimum of [tex]\frac{63\times 185}{100}g[/tex] or 116.6 g of Cu

Mass range of Cu in yellow zinc is 116.6-122.1 g

(b) 100 g of yellow zinc contains maximum of  37 g of Zn and minimum of 34 g of Zn

So 46.5 g of yellow zinc contains maximum of [tex]\frac{37\times 46.5}{100}g[/tex] or 17.205 g of Zn and minimum of [tex]\frac{34\times 46.5}{100}g[/tex] or 15.81 g of Zn

Mass range of Zn in yellow zinc is 15.81-17.205 g

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