Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The following process has been used to obtain iodine from oil-field brines in California.
Nal + AgNO 3 
Agl + NaNO 3
2AgI + Fe 
Fel 2 + 2Ag
2FeI 2 + 3Cl 2 
2FeCl 3 + 2I 2
How many grams of AgNO 3 are required in the first step for every 254 kg I 2 produced in the third step.
Text Solution
Verified by ExpertsThe correct answer is:
A
Balanced equation:
Nal + AgNO 3 
Agl + NaNO 3
2AgI + Fe 
Fel 2 + 2Ag(b)
2FeI 2 + 3Cl 2 
2FeCl 3 + 2I 2
From
= 
= 
= 
∴ mole of I 2 = (mole of FeI 2 )
= 
= 
= 
2 × 10 3 = mole of AgNO 3 = 
mass of AgNO 3 = 170 × (2 × 10 3 ) g = 340 × 10 3 g = 340 kg.
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