Concept explainers
(a)
Interpretation:
The empirical formula of fumaric acid in which the elemental composition is 41.4% C, 3.5 % H and 55.1 % O needs to be determined.
Concept introduction:
Empirical formula is the simplest formula of any organic or inorganic compound that represents the simple ratio of all atoms present in the molecule. It can be calculated with the help of elemental composition of molecule. Certain steps must be used to get the empirical formula:
- Consider mass % as mass in grams and calculate moles of element with the help of molar mass
- Calculate the moles of each element in least whole number
- Write the number of each atom as subscript to write the empirical formula.
(b)
Interpretation:
The molecular weightof fumaric acidneeds to be determined.
Concept introduction:
Osmotic pressure is a colligative property that depends on the number of solute particles in the solution. It is mainly used to calculate the molecular weight of substance dissolve in certain volume of solvent. The relation between osmotic pressure and concentration can be shown as:
(c)
Interpretation:
Thethree possible structures of fumaric acid if the empirical formula is CHO and molar mass is 116 g/mol needs to be determined.
Concept introduction:
Empirical formula is the simplest formula of any organic or inorganic compound that represents the simple ratio of all atoms present in the molecule. It can be calculated with the help of elemental composition of molecule. Certain steps must be used to get the empirical formula:
- Consider mass % as mass in grams and calculate moles of element with the help of molar mass
- Calculate the moles of each element in least whole number
- Write the number of each atom as subscript to write the empirical formula.
(d)
Interpretation:
The correct structure of fumaric acid if it contains a trans double bond needs to be determined.
Concept introduction:
Empirical formula is the simplest formula of any organic or inorganic compound that represents the simple ratio of all atoms present in the molecule. It can be calculated with the help of elemental composition of molecule. Certain steps must be used to get the empirical formula:
- Consider mass % as mass in grams and calculate moles of element with the help of molar mass
- Calculate the moles of each element in least whole number
- Write the number of each atom as subscript to write the empirical formula.
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LCPO CHEMISTRY W/MODIFIED MASTERING
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