How many grams of alum can be obtained from 20.0g of aluminum when the reaction proceeds with 100% yield? 80%?

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How many grams of alum can be obtained from 20.0g of aluminum when the reaction proceeds with 100% yield? 80%?

Need help!!! Thanks : )

2007-10-18 05:25:18 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

1 answers

What do you mean by alum? Aluminum sulfate?

Anhydrous aluminum sulfate has a chemical formula of Al2(SO4)3. Thus it has a molecular weight of 27*2 + 3*(32 + 4*16) = 342

So 100% reaction would yield 20 * 342/54 = 126.7 g
An 80% reaction would yield 20 * 342/54 * 0.8 = 101.3 g

2007-10-18 05:33:22 · answer #1 · answered by gebobs 6 · 0⤊ 1⤋