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CBSE Class 11-science Answered

1 gram mixture of cuprous and cupric oxides was reduced to 0.839 gram metallic copper. What is the weight of cuprous oxide in sample

Asked by shahrithik07 | 08 Oct, 2018, 09:25: AM
Expert Answer
The reaction equations are:
 

Atomic space weight space of space Cu space equals space 63.5

Molecular space weight space of space Cu subscript 2 straight O space equals space 143

Molecular space weight space of space CuO space equals 79.5

Let comma

Moles space of space Cu subscript 2 straight O space equals space straight x space

Moles space of space CuO space equals space straight y

therefore 143 straight x space plus space 79.5 straight y space equals 1

and

127 straight x space plus space 63.5 space straight y space equals space 0.839

after space solving semicolon

straight y space equals space 0.0069

So comma space weight space of space CuO space equals space 79.5 cross times space 0.0069
space space space space space space space space space space space space space space space space space space space space space space space space space space space
space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 0.548 space straight g

Weight space of space space Cu subscript 2 straight O space equals space 0.45 space straight g
 
weight of Cu2O is 0.45 g
Answered by Varsha | 08 Oct, 2018, 11:30: AM
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