(A) A 1.00 g sample of a magnesium-aluminum alloy yields 0.107 g H 2 when treated with...

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(A) A 1.00 g sample of a magnesium-aluminum alloy yields 0.107 g H2 when treated with an excess of HCl(aq). What is the percentage by mass of Al in the alloy?

(B) A 1.500 g sample of a mixture containing only Cu2O and CuO was treated with hydrogen to produce copper metal and water. After the water evaporated, 1.2244 g of pure copper metal was recovered. What is the percentage by mass of Cu2O in the original mixture? Balanced chemical equations are given below for the reactions involved.

CuO(s) + H2(g) → Cu(s) + H2O(l)
Cu2O(s) + H2(g) → 2 Cu(s) + H2O(l)

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General Chemistry Principles And Modern Applications

ISBN: 9780132931281

11th Edition

Authors: Ralph Petrucci, Jeffry Madura, F. Herring, Carey Bissonnette

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