Interpretation:
The chemical formula for potassium permanganate needs to be written and the mass of 2.55 mol of it needs to be determined.
Concept introduction:
The number of moles can be used to calculate mass of a substance using its molar mass. The relation is represented as follows:
Here, n is number of moles, m is mass and M is molar mass.
Answer to Problem 39PP
The chemical formula of potassium permanganate is
Explanation of Solution
Given Information:
The number of moles of potassium permanganate is 2.55 mol.
Calculation:
To calculate the mass, first calculate molar mass of potassium permanganate using its chemical formula.
The chemical formula of potassium permanganate is
From the above formula, there is 1 K atom, 1 Mn atom and 4 O atoms in 1 molecule of
The molar mass of K, Mn and O is 39.1 g/mol, 54.95 g/mol and 16 g/mol respectively. Therefore, molar mass of
Mass of
Putting the values,
Therefore, mass of
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