Equivalent mass in redox reactions
Answers are for parents and teachers.
1
In its reaction with iodine (2Na₂S₂O₃ + I₂ → Na₂S₄O₆ + 2NaI) one formula unit gives 1 e⁻. Find E (M = 158).
158
2
How many grams of FeSO₄ (E = 152) react in acidic medium with 98 g of K₂Cr₂O₇ (E = 49)?
304
3
How many grams of KI (E = 166) react with 51 g of H₂O₂ (E = 17)?
498
4
How many equivalents are in 126 g of Na₂SO₃ (E = 63)?
2
5
How does the law of equivalents make solving problems easier?
Masses can be found from the ratio of E values without balancing the equation.