Question

How many atoms of N are in 0.82 g of NaNO3? ( molar conversion)

Answer 1

The number of atoms N = 5.8 x 10²¹

Further explanation

A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12

1 mole = 6.02.10²³ particles

mass of N in 0.82 g of NaNO₃ (MW NaNO₃: 85 g/mol) :

`\tt mass~N=(Ar~N)/(MW~NaNO_3)* mass~NaNO_3\\\\mass~N=(14)/(85)* 0.82\\\\mass~N=0.135~g`

moles of N :

`\tt mol=(mass)/(Ar)\\\\mol=(0.135)/(14)=0.0096`

The number of atoms N :

`\tt N=n* No\\\\N=0.0096* 6.02* 10^(23)\\\\N=5.8* 10^(21)~atoms`