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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 O2 is ________ g mol–1.

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answer is 160.

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Detailed Solution

4FeCr2O4+8Na2CO3+7O2→8Na2CrO4+2Fe2O3+8CO2

Fe2O3is water insoluble, so its molar mass

⇒[2×56+3×16]⇒160g/mol

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