# A piece of copper-tin alloy contains 45% copper. What is the mass of a piece if it contains 90

September 26, 2021 | education

| **A piece of copper-tin alloy contains 45% copper. What is the mass of a piece if it contains 90 grams of copper? How many grams of tin are in a piece?**

The mass of copper in a piece of alloy is 90g, which is 45%.

1) If the entire alloy is 100%, and the mass of the entire piece is X, then we get the following equation:

45/90 = 100 / x

45x = 90 * 100

45x = 9000

x = 9000/45

x = 200

200 g – weight of the entire alloy

2) Now we find the mass of tin in the piece:

200 – 90 = 110 g

Answer: the mass of the piece is 200 g, the mass of tin in the alloy is 110 g.

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