Question

Given the following equation:

Answer 1

Mass of KMnO4 required : 31.607 g

Further explanation

The reaction equation is the chemical formula of reagents and product substances  

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products  

Reaction

2KMnO₄ → K₂MnO₄ + MnO₂ + O₂

mol of O₂ :

$\tt \dfrac{1.6}{16}=0.1$

mol ratio KMnO₄ : O₂ = 2 : 1

mol of KMnO₄ :

$\tt \dfrac{2}{1}\times 0.1=0.2$

mass of KMnO₄ :

MW KMnO₄ : 158,034 g/mol

$\tt mass=0.2\times 158,034 =31.607~g$