
Concept explainers
Interpretation:
The percent by mass of manganese in the given sample has to be calculated.
Concept introduction:
Mass percent: To express the concentration of a component in a mixture we can use mass percent. Dividing the grams of solute by grams of solution and then multiply with 100 to obtain percentage.
The formula to calculate mass percent is

Answer to Problem 21.62QP
The percent by mass of manganese in the given sample is
Explanation of Solution
The reaction between iron ion and permanagate and its balanced equation is represented as follows.
To determine percent by mass of manganese
From the above equation we can say that 1 mole of permanganate is equalent to 5 moles of iron (II) ion.
From this we can calculate the original amount of ion (II) is
Now, determine the excess amount of iron (II) with the help of balanced equation.
From the above equation we can say that 1 mole of dicromate is equalent to 6 moles of iron (II) ion. The excess amount of iron (II) is calculated as follows
The consumed amount of iron is
From the above values, find the mass of manganese
Therefore, the percent by mass of manganese is
The percent by mass of manganese in the given sample was
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Chapter 21 Solutions
Chemistry: Atoms First V1
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