Concept explainers
(a)
Interpretation:
The mass percent of C, H and O in starch needs to be determined.
Concept introduction:
Starch is present in plant cells and is a polysaccharide consists of several glucose units.
Mass percent of an atom present in the sample can be determined by dividing mass of atoms present in the monomer to the overall mass of the monomer unit and multiplying the overall result with 100%.
For example, the mass percent of x g of an atom present in the y g of monomer unit can be determined as:
(b)
Interpretation:
Interpret number of monomer unit of C6 H10 O5 in starch needs to be determined.
Concept introduction:
Starch is present in plant cell wall and is a polysaccharide consists of several glucose units in it.
The molar mass of any compound can be calculated by taking sum of molar masses of all the atoms present in that compound.
For a molecular formula of compound Cx Hy Oz, the molar mass can be calculated as follows:
Molar mass of compound = (Number of C)

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Chapter 23 Solutions
PRINCIPLES+REACTIONS
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