Redox and Equivalent ConceptHard
Question
When copper oxide is strongly heated with hydrogen, it reduces to copper. The loss in its weight is 14.9 g and the weight of water formed was 16.78 g. What is the equivalent weight of oxygen, taking the equivalent weight of hydrogen as 1.008?
Options
A.8.000
B.7.989
C.8.064
D.16.00
Solution
Mass of oxygen present = 14.9 g and mass of hydrogen combined with oxygen to form water
= 16.78 – 14.9 = 1.88 g.
∴ Equivalent weight of oxygen = $\frac{14.9}{1.88} \times 1.008 = 7.989$
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