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Mole Concept PART 3 | NEET Conquer Batch 2024 | Wassim Bhat Unacademy NEET
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Mole Concept PART 3 | NEETConquer Batch 2024 | Wassim
Bhat
Unacademy NEET
Percentage Purity
Percentage purity is defined as the mass of the
pure compound in grams which is present in 100
grams of its impure sample. It can be calculated
using the formula:
Percentage purity of a compound = (Mass of pure
compound / Mass of impure sample) x 100
The impure sample contains impurities that do
not participate in the chemical reaction. To
calculate the mass of pure compound, we need to
subtract the mass of impurities from the mass of
the impure sample. For example, if we have an
impure sample of calcium carbonate, we can
calculate the mass of pure calcium carbonate
using the formula above.
Example:
Suppose we have an impure sample of calcium
carbonate weighing 50 grams. Out of the 50
grams, we have 20 grams of pure calcium
, carbonate. To calculate the percentage purity of
calcium carbonate, we can substitute these
values in the formula:
Percentage purity of calcium carbonate = (20g /
50g) x 100 = 40%
This means that 40 grams of pure calcium
carbonate are present in 100 grams of the impure
sample.
Decoding Statements
When given a statement like "50 grams of 80
percent pure calcium carbonate", we can decode
it by calculating the mass of pure calcium
carbonate. In this case, the mass of pure calcium
carbonate would be 80% of 50 grams, or 40
grams. Similarly, "70 grams of 50 percent pure
NaCl" means that the mass of pure NaCl is 50% of
70 grams, or 35 grams.
Calculating Volume of Gas Produced
To calculate the volume of gas produced in a
reaction, we need to first calculate the number
of moles of the gas produced. For example, if we
heat 0.4 moles of pure calcium carbonate, it will
produce 0.4 moles of carbon dioxide gas. We can
then use Avogadro's law to calculate
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