(a)
Interpretation:
The elements present in the compound needs to be identified and its molecular formula needs to be determined.
Concept introduction:
The compound is made up of different atoms and molecules.
These atoms and molecules have charge (valencies) on them to form stable compounds.
A chemical formula is a type of formula for the compound in which different elements are present and shows their relative composition in a compound.
For example
(a)
Explanation of Solution
The compound sodium sulphate is formed from sodium and sulphate ion.
Here, sulphate ion is
Sodium is Na having charge of
So, the chemical formula is
The chemical formula is
(b)
Interpretation:
Whether the compound is ionic or covalent needs to be determined.
Concept introduction:
A compound is ionic when formed from complete transfer of election from electropositive atom to electronegative atom. It is formed when electro negativity difference is more.
A compound is covalent when formed from mutual sharing of elections from the atom. It is formed when electro negativity difference is less.
Explanation of Solution
The formula for compounds is
c.
Interpretation:
The percent by mass of each element in sodium sulphate needs to be calculated.
Concept introduction:
A compound is formed from different composition. By percent of mass, one can find the composition of that element in that compound.
The molecular formula is required in this calculation.
c.
Answer to Problem 57PP
Explanation of Solution
To find percent by mass of each element in compound
Atomic mass of Sulphur
Atomic mass of oxygen
Total molar mass of compound
Percentage by mass of sodium
Percentage by mass of sulphur
Percentage by mass of oxygen
Chapter 10 Solutions
Chemistry: Matter and Change
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