Science, asked by dracula181, 9 months ago

Write a note on 'Mole Concept'.​

Answers

Answered by zakirhussain786
0

Explanation:

The mole is the unit of measurement in

the International System of Units (SI) for

amount of substance. The unit is

defined as the amount of a chemical

substance that contains as many

representative particles, e.g., atoms,

molecules, ions, electrons, or photons,

as there are atoms in 12 grams of

carbon-12 (12C), the isotope of carbon

with standard atomic weight 12 by

definition. This number is expressed by

the Avogadro constant, which has a

value of

7023602214085700000 6.0221408

57 x 1023 mol-1, which is just over 602

sextillion (thousand million million

million). The mole is one of the baseunits of the SI, and has the unit symbol mol.

The mole is widely used in chemistry as

a convenient way to express amounts

of reactants and products of chemical

reactions. For example, the chemical

equation 2 H2 + O2 + 2 H2O implies

that 2 moles of dihydrogen (H2) and

1 mole of dioxygen (O2) react to form

2 moles of water (H2O). The mole may

also be used to express the number of

atoms, ions, or other elementary

entities in a given sample of any

substance.

The concentration of asolution is commonly expressed by its

molarity, defined as the number of

moles of the dissolved substance per

litre of solution.

The number of molecules per mole is

known as Avogadro's constant, and is

defined such that the mass of one mole

of a substance, expressed in grams, is

equal to the mean relative molecular

mass of the substance. For example,

the mean relative molecular mass of

natural water is about 18.015, therefore,

one mole of water has a mass of about

18.015 grams.

The term gram-molecule was formerly

used for essentially the same concept.The term gram-atom has been used for a related but distinct concept,

namely a quantity of a substance that

contains Avogadro's number of atoms,

whether isolated or combined in

molecules.

Thus, for example, 1 mole of

MgBr2 is 1 gram-molecule of MgBr2 but

3 gram-atoms of MgBr2.

Answered by payal2176
0

Explanation:

A mol (symbol mole) is define as the amount of substance that contains as many atoms, ions, molecules, electrons or any other elementary entities has there are carbon atoms is exactly 12 gm of .the number of atoms in 12 gm of is called Avogadro number .

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