Question

3 formulas of mole concept of class 9

Answer 1

n=M/m
n=N/N_A
M/m=N/N_A

n=number of moles
M=given mass
m=molar mass
N=number of atoms
N_A=Avogadro's number

Answer 2

3 formulas of mole concept of class 9

Formula 1:

• To calculate the number of atoms/molecules (N) the following formula is applied:

$N = \frac{m}{M}\times N_0$

Where:

• m - Given mass
• M - Molar mass
• $N_0$ - Avogadro number

Formula 2:

• To calculate the number of moles (n) the following formula is applied:

$n=\frac{N}{N_0}$

Where:

• N - Given number of particles

• $N_0$ - Avogadro number

Formula 3:

• To calculate number of particles (N) the following formula is applied:

$N = n\times N_0$

Where:

• n - Number of moles of the particles

• $N_0$ - Avogadro number

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