Question

The molar mass of the water insoluble product formed from the fusion of chromite ore \(FeCr_2\text{O}_4\) with \(Na_2\text{CO}_3\) in presence of \(O_2\) is ....... g mol\(^{-1}\):

Hint:

To calculate the molar mass of a compound, add the molar masses of the constituent atoms.

Answer 1

Correct Answer: 196

- The fusion of chromite ore (\( \text{FeCr}_2\text{O}_4 \)) with Na₂CO₃ and oxygen leads to the formation of Fe₂O₃ and Cr₂O₃ as products.
- The molar mass of the water-insoluble product (Cr₂O₃) is calculated: \[ \text{Molar mass of Cr}_2\text{O}_3 = 2(52) + 3(16) = 196 \, \text{g/mol} \] Thus, the molar mass of the water-insoluble product is 196 g/mol.