Question

Given the balanced equation: 2KClO3 -->2KCl + 3O2

How many grams of KCl are produced by decomposing 1.5 mol KClO3 ?
molar mass KCl=74.6 g
a
111.9 g
b
72.5 g
c
15.0 g
d
85.2 g

Answer 1

Option a → 111.9 g

Step-by-step explanation:

The reaction is this:

2KClO₃ → 2KCl + 3O₂

2 moles of chlorate decompose to 2 moles of chloride and 3 moles of oxygen. Ratio is 2:2.

If I use 1.5 moles of chlorate I'll get the same moles of chloride by the decomposition.

Let's convert the moles to mass: 1.5 mol . 74.6 g / 1mol = 11.9 g