Concept explainers
Determine the percent composition of
Interpretation:
Percentage composition of MgCO3.5H2O need to be determined and the hydrate must be represented with a pie graph.
Concept introduction:
Percentage of an element in a compound can be calculated as follows:
Percentage of an element in a compound
Answer to Problem 183A
Percentage composition of MgCO3.5H2O is 13.79 % Mg, 73.56 % O, 6.90 % C and 5.75 % H.
Thus, pie chart is represented as follows:
Explanation of Solution
Molar mass of MgCO3.5H2O is 174 g/mol.
Atomic mass of Mg, O, C and H are 24 amu, 16 amu, 12 amu and 1 amu respectively.
The mass percentage of Mg, O and C can be calculated as follows:
% of Mg
% of O
% of C
% of H
Thus, % of all the elements are shown in the pie chart which shows that O is maximum and H is minimum.
Thus, 13.79 % Mg, 73.56 % O, 6.90 % C and 5.75 % H is present in MgCO3.5H2O.
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