Question

The mineral haematite is fe2o3. Haematite ore contains unwanted material called gangue in addition to fe2o3. If 5 kg of ore contains 2.78 kg of fe, what percentage of ore is gangue?

Answer 1

Explanation:

ore weight = 5 kg

fe weight= 2.78 kg

gangue weight= 5-2.78

= 2.22 kg

let percentage of gangue be x

now percentage of gangue is

2.22 = 5×x/100

222=5x

222/5 = x

44.4=x

hence gangue is 44.4% in ore

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