Question

calculate the no. atoms of 100u of he

Answer 1

$\huge\red{AS-salamualykum}$


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$\huge\pink{Given:-}$

Mass of He =100u

Molar mass of He = 4g/mol

$\huge\blue{Required:-}$

Atoms of He = ?

$\huge\green{Solution :-}$

Moles of He = mass/molar mass


Moles of He = 100/4

Molex of He = 25mol


Moles of He = number of atoms of He / Avagadro number


Number of atomsof He = moles of He × Avagadro number

Number of atoms of He = 25 × 6.023×10^23


Number of atoms of He = 150 ×10^23


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