Question

what weight of HNO3 is needed to convert 5 g of iodine into iodic acid according to the reaction:

I2 + HNO3 - HIO3 +NO2 +H2O

ans 1)12.4g 2)24.8g 3)0.248g 4)49.6g

pls ans

Answer 1

According to the choices given, the mass of iodine should be 50g.

CALCULATIONS :

From the given equation, the mole ratio is 1 : 1

Molar mass of iodine gas = (127 × 2) g / mol = 254 g / mol

Moles = 50 / 254 = 0.19685 moles

Moles of iodine = moles of nitric acid = 0.19685 moles.

Molar mass of nitric acid = 63g / mol

Mass of nitric acid = 63 × 0.19685 = 12.40 g