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Percentage Composition of an Element in a Compound

% mass of an ...

Question

$%$ mass of an element = $\frac{___}{M o l a r m a s s o f t h e c o m p o u n d} \times 100$

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Solution

Part 1: $%$ mass of an element
The percentage composition of an element in a compound is the percentage of the mass contributed by the element to the total mass of the compound.
It is obtained by dividing the mass of that element in the compound by the total mass of the compound and multiplying by 100 i.e., $\frac{M a s s c o n t r i b u t e d b y t h e e l e m e n t}{M o l a r m a s s o f t h e c o m p o u n d} \times 100$
Final answer:- $%$ mass of an element = $\frac{M a s s c o n t r i b u t e d b y t h e e l e m e n t}{M o l a r m a s s o f t h e c o m p o u n d} \times 100$

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Illustrate the molar mass of an element with an example.

Q. An organic compound of molar mass greater than

100 g m o l^{- 1}

C

H

N

C

is six times the mass of

H

, while the sum of mass of

C

H

is 1.5 times the mass of

N

\frac{Least molecular mass}{28}

Q. An organic compound of molar mass greater than

100

contains only C, H and N. The percentage of C is 6 times that of H while the sum of percentages of C and H is 1.5 times that of N. What is the least molar mass of the compounds?

Which among the following formulae can be used for calculating the concentration?

(i) $\frac{mass of solute}{mass of solution} \times 100$

(ii) $\frac{mass of solute}{mass of solute + solvent} \times 100$

(iii) $\frac{mass of solvent}{mass of solution} \times 100$

(iv) $\frac{mass of solvent}{mass of solute + solvent} \times 100$

(v) $\frac{mass of solute}{volume of solution} \times 100$

(vi) $\frac{mass of solvent}{volume of solution} \times 100$

Q. In an organic compound of molar mass greater than

100

containing only

C, H

N

, the percentage of

C

6

times the percentage of

H

while the sum of the percentages of

C

H

1.5

times the percentage of

N

. What is the least molar mass?

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