Determine the mass of substance X, formed by the reaction equation from 5 moles

Determine the mass of substance X, formed by the reaction equation from 5 moles of potassium iodide KMnO4 + KI + H2SO4- MnSO4 + X + K2SO4 + H2O

Let’s write down the solution:
1. We compose the equation according to the condition of the problem:
2KMnO4 + 10KJ + 8H2SO4 = 2MnSO4 + 5J2 + 6K2SO4 + 8H2O – OBP, iodine was obtained;
2. Calculation of the molar mass of substances:
M (KJ) = 166 g / mol;
M (J2) = 253.8 g / mol (substance – X).
3. Let’s make the proportion according to the equation:
5 mol (KJ) – X mol (J2);
-10 mol – 5 mol hence, x mol (J2) = 5 * 5/10 = 2.5 mol.
4. Find the mass of iodine by the formula:
m (J2) = Y * M = 2.5 * 253.8 = 634.5 g. = 635 g.
Answer: b, which is equal to 635 g of iodine.