Question

Hey.....!!
Explain mole concept briefly??
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Answer 1

Mole is the amount of a substance containing the same number of elementary units as number of atoms present in 12grams of carbon-12 isotope.
What it actually means is that any 1 mole of a compound/element has an Avogadro number of molecules/atoms.

Also, 1 mole of a gas occupies 22.4 litres at 0°C and 1 atm pressure.

Formula for calculating moles of a substance is $moles= \frac{mass}{molar mass}$ where molar mass means mass of 1 mole of that substance.

*Avogadro's number is $6.023 \times 10^{23}$

Answer 2

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HERE IS YOUR ANSWER :))

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☆ The mole is a unit of measurement for the amount of substance. Moles give us a consistent method to convert between atoms/molecules and grams.

《 The mathematical expression for calculating moles is expressed as:

$= > moles \: = \frac{mass}{molar \: mass}$

■ We can express moles in terms of molecular mass, number of atoms/molecules and in terms of volume.

▪  1 mole of a pure substance has a mass in grams equal to its molecular mass.
▪ 1 mole contains the same number of particles as there are in 12g of carbon-12 atoms. This number is called Avogadro’s number and is equal to 6.023 × 10^23particles.
▪ 1 mole of a gas occupies a volume of: 22.4 litres at S.T.P.

==> For example: 1 mole of sodium atom has mass 23 g. It contains 6.023 × 10^23 atoms and occupies 22.4 litres of volume at S.T.P.

Let us solve a simple numerical to understand this concept in a better way.

●Numerical:

Calculate the number of particles in each of the 46 g of Na atoms.

● Solution:

==> In this numerical it is desired to find the number of particles in 46 gm of Na.

We know that one mole of Na contains 6.023 × 10^23 particles.

Therefore, we will first find the number of moles in 46 gm of Na.

$moles = \frac{mass}{molar \: mass} \\ \\ = \frac{46}{23 } \\ \\ = 2 \: moles$

We know that 1 mole = 6.022 × 10^23 particles.

Therefore, 2 moles = 2×6.022 × 10^23 particles

  = 12.044 × 10^23 particles

■ Hence, 46 gm of Na contains 12.044 × 10^23particles.

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HOPE IT HELPS U !!!

# NIKKY