Question

KClO₃ disproportionates on heating to give KCl and KClO₄ only. The number of moles of KClO₄ produced on complete disproportionation of 24.5 g KClO₃ is

• A. 0.156
• B. 0.106
• C. 0.126
• D. 0.206
• E. 0.056

Answer 1

Answer:

Step 1: Explanation:

A mole ratio is ​the ratio between the amounts in moles of any two compounds involved in a chemical reaction. The mole ratio can be determined by examining the coefficients in front of formulas in a balanced chemical equation.

Step 2: write the balanced chemical equation.

4 KClO3(s)--------> 3 KClO4(s) + KCl(s)

Step 3: calculate the moles of KClO3

we know, moles = mass given / molar mass

molar mass of KClO3  = 122.55 g/mol

mass = 24.5 g

on substituting the value

Moles of  KClO3 = ( 24.5 g / 122.55 g/mol ) = 0.2 mol

Step 4: calculate the moles of KClO4

4 KClO3(s)--------> 3 KClO4(s) + KCl(s)

According to the reaction:
4 mol of KClO3 produces 3 mol of KClO4
0.2 mol of KClO3 will produce = ( 3 mol of KClO4  / 4 mol of KClO3 ) × 0.2 mol of KClO3 = 0.15 mol of KClO4
Hence, the number of moles of KClO4 produce is ≈ 0.156 mol of KClO4 ----> option(A)