CBSE Class 11-science Answered
1 g mixture of cuprous and cupric oxides was reduced to 0.849 g metallic copper. What is the weight of cuprous oxide in sample
Asked by Anil | 13 May, 2017, 09:46: PM
Expert Answer
Wt. of Cu2O and CuO = 1g
Wt. of CuO = x g
Hence Wt. of Cu2O = (1-x)g
Cu2O → 2Cu + ½ O2
CuO → Cu + ½ O2
Hence moles of Cu by principle of atom conservation
= 2x moles of Cu2O + moles of CuO
Moles of Cu2O = 1-x/143
Moles of CuO = x/79.5
Hence Moles of Cu = 2(1-x/143) + x/79.5
Weight of copper
2(1-x/143) x63.5 + x x 63.5/79.5 = 0.849
2-2x/143 + x/79.5 =0.849/63.5
159 -159x + 143x = 0.849 x 143 x 79.5/63.5
-159 x + 143 x= 152 -159
16x =7
x = 0.437 g
Answered by Vaibhav Chavan | 15 May, 2017, 12:06: PM
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