Concept explainers
(a)
Interpretation:
Empirical formula for the paclitaxel has to be given.
Concept Introduction:
Empirical formula is the one that can be determined from the molar mass of the elements that is present in the compound and the mass percentage of the elements. The mass percentage of the elements present in the compound is converted into the moles of each element considering the molar mass of each element. The relative number of moles for each type of atoms is found out finally.
(a)
Answer to Problem F.18E
Empirical formula of paclitaxel is
Explanation of Solution
The mass percentage composition of paclitaxel is given as
The mass percentage of oxygen is calculated as shown below;
Considering
Number of moles of each element present in the compound can be calculated using the molar mass and mass of the element as follows;
Dividing the moles of element obtained using the smallest amount, the ratio can be obtained as shown below;
The ratio of the atoms in the compound is given as follows;
Thus in compound the atoms are present in the ratio of
Therefore, the empirical formula for the compound can be given as
(b)
Interpretation:
Molecular formula of paclitaxel has to be found out.
Concept Introduction:
Empirical formula is the one that can be determined from the molar mass of the elements that is present in the compound and the mass percentage of the elements. The mass percentage of the elements present in the compound is converted into the moles of each element considering the molar mass of each element. The relative number of moles for each type of atoms is found out finally.
Molecular formula of a compound can be found if the empirical formula and molar mass of the compound is known. The molar mass of compound is divided by the molar mass of the empirical formula in order to obtain the factor which is multiplied with the coefficients of empirical formula in order to obtain the molecular formula.
(b)
Answer to Problem F.18E
Molecular formula of paclitaxel is
Explanation of Solution
Empirical formula of the compound is
Molar mass of the empirical formula is calculated as follows;
Molar mass of the paclitaxel is divided by the molar mass of empirical formula in order to obtain the factor as shown below;
The coefficient of empirical formula is multiplied by the factor
Therefore, the molecular formula of paclitaxel is
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Chapter F Solutions
Chemical Principles: The Quest for Insight
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