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Question
A brass alloy contains 70% copper by mass. Calculate the quantities of copper and zinc present in 120 g of brass.
Numerical
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Solution
Given:
Brass contains 70% copper by mass.
Mass of copper in 120 g of brass
= `70/100 xx 120 = 84 "g"`
Mass of zinc = Total mass of brass − Mass of copper
= 120 g − 84 g = 36 g
Hence, 120 g of brass contains 84 g of copper and 36 g of zinc.
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