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If a 4.50 g sample of a Zn-Al-Cu alloy contains 2.45 g Zn and 1.34 g Al, what is the percent composition of Cu?

2006-08-27 11:51:22 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry

4.5 - (2.45+1.34) = .71g
.71 / 4.5 = 15.7778%

2006-08-27 11:58:05 · answer #1 · answered by kdefranceschi 2 · 0⤊ 0⤋

gram of Cu = 4.5 - 2.45 - 1.34

gram of Cu / gram of sample * 100 = percent mass composition.

that's right?

2006-08-27 18:56:15 · answer #2 · answered by ___ 4 · 0⤊ 0⤋