Iron (III) oxide chunks contain 80 ppm silica (SiO2). What is the concentration of this impurity in mass%?(a) 0.008%(b) 0.080%(c) 0.800%(d) 8.000%I had been asked this question in exam.I would like to ask this question from Expressing Concentration of Solutions topic in chapter Solutions of Chemistry – Class 12

Iron (III) oxide chunks contain 80 ppm silica (SiO2). What is the conc

1.	Iron (III) oxide chunks contain 80 ppm silica (SiO2). What is the concentration of this impurity in mass%?(a) 0.008%(b) 0.080%(c) 0.800%(d) 8.000%I had been asked this question in exam.I would like to ask this question from Expressing Concentration of Solutions topic in chapter Solutions of Chemistry – Class 12
Answer» The correct choice is (a) 0.008% Best explanation: 80 ppm silica MEANS there are 80 mg of silica is 10^6 mg (or 1 kg) of iron (III) oxide and silica mixture. The mixture can be regarded as 10^6 mg (or 1 kg) of iron (III) oxide since 80<<10^6 MASS% = (mass of impurity/mass of total mixture) X 100% Mass% = (80mg/10^6mg) x 100% = 0.008%.

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