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Statement-1 : One mole of any substance ...

Statement-1 : One mole of any substance at any temperature, pressure or volume always contains `6.02 xx 10^(23)` molecules.
Statement-2 : This is the value of Avogadro's number

A

Statement-1 is ture, statement-2 is true and statement-2 is correct explanation of statement-1

B

Statement-1 is ture, statement-2 is true but statement-2 is not correct explanation of statement-1

C

Statement-1 is true, but statement-2 is false.

D

Statement-1 is false, but statement-2 is true.

Text Solution

Verified by Experts

The correct Answer is:
A
Both the statements are true and statement-2 is the correct explanation of statement-1.
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Avogadro's law states that under similar condition of T and P, equal number of particles. Experiments show that at one atmosphere pressure and at a temperature 273 K (i.e. at STP) one mole of any gas occupies a volume approximately 22.4 litre. Therefore number of moles of any sample of gas can be found by comparing its volume at STP with 22.4. 1 mole of any species contains 6.023xx10^(23) particles which is denoted by symbol N_(A) . Number of atoms present in 1 gm-atom of an element or number of molecules present in 1 gm-molecule of any substance is equal to N_(A) . Hence it is number of particles present in one mole of the substance. The number of gm atoms of oxygen present in 0.2 mole of H_(2)S_(2)O_(8) is.

Avogadro's law states that under similar condition of T and P, equal number of particles. Experiments show that at one atmosphere pressure and at a temperature 273 K (i.e. at STP) one mole of any gas occupies a volume approximately 22.4 litre. Therefore number of moles of any sample of gas can be found by comparing its volume at STP with 22.4. 1 mole of any species contains 6.023xx10^(23) particles which is denoted by symbol N_(A) . Number of atoms present in 1 gm-atom of an element or number of molecules present in 1 gm-molecule of any substance is equal to N_(A) . Hence it is number of particles present in one mole of the substance. At STP 11.2 L of CO_(2) contains.