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) :

$\tt mass~N=\dfrac{Ar~N}{MW~NaNO_3}\times mass~NaNO_3\\\\mass~N=\dfrac{14}{85}\times 0.82\\\\mass~N=0.135~g$

moles of N :

$\tt mol=\dfrac{mass}{Ar}\\\\mol=\dfrac{0.135}{14}=0.0096$

The number of atoms N :

$\tt N=n\times No\\\\N=0.0096\times 6.02\times 10^{23}\\\\N=5.8\times 10^{21}~atoms$

4 0

3 years ago

The primary mechanism for converting atmospheric carbon into usable forms for life on earth is achieved by

Elan Coil [88]

The primary mechanism for converting atmospheric carbon into usable forms for life on earth is achieved by photonsynthesis. It is a process where plants convert carbon dioxide into forms that can be used by living organisms which is oxygen. Oxygen is a very essential product of photosynthesis which is being used by living organisms to survive.

7 0

3 years ago

Read 2 more answers

I will mark who is right!!!!!!! Please help it’s due in 10 minutes!

Helen [10]

Answer: I'm thinking it should be either stay the same or decrease

Explanation: If the size is increasing then the sample should not increase but decrease or stay the same. Mainly the sample would do the opposite of what the size is doing

3 0

4 years ago

How to know the elements amount of charge amount​

How to know the elements amount of charge amount