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Q.

The molar mass of the water insoluble product formed from the fusion of chromite ore (FeCr₂O₄) with Na₂CO₃ in presence of O₂is ________ g mol^–1.

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answer is 160.

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Detailed Solution

$4 {FeCr}_{2} O_{4} + 8 {Na}_{2} {CO}_{3} + 7 O_{2} \to 8 {Na}_{2} {CrO}_{4} + 2 {Fe}_{2} O_{3} + 8 {CO}_{2}$

${Fe}_{2} O_{3}$ is water insoluble, so its molar mass

$\Rightarrow [2 \times 56 + 3 \times 16] \Rightarrow 160 g / mol$

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