Respuesta :

Erythrosin17
To determine the number of nitrogen atoms in the given amount of a compound, we need to know the number of moles of nitrogen. In order to come to this, its is important tht we know the chemical formula of the compound which would be Cu(NO3)2 (molar mass = 187.56 g/mol). When we obtain the moles of nitrogen, we use Avogadro's number to convert the number of moles to atoms. 

Moles Cu(NO3)2 = 10.2 g Cu(NO3)2 ( 1 mol / 187.56 g ) = 0.0544 mol 
Moles N = 0.0544 mol Cu(NO3)2 ( 2 mol N / mol Cu(NO3)2 ) = 0.109 mol
Atoms N = 0.109 mol N ( 6.022 x20^23 atoms N / mol N ) = 6.55x10^22 atoms N 
okpalawalter8

We have that from the Question"How many nitrogen atoms are in 10.2 g of copper(ii) nitrate?" it can be said that    nitrogen atoms in 10.2 g of copper(ii) nitrate are

  • aN=6.55x10^22 atoms of N

From the Question we are told

How many nitrogen atoms are in 10.2 g of copper(ii) nitrate?

Generally the equation for copper(ii) nitrate is mathematically given as

Cu(NO3)2

Therefore

For 10.2 g of copper(ii) nitrate

to find moles

Moles Cu(NO3)2 = 10.2 g Cu(NO3)2

0.054mol = 10.2 g Cu(NO3)2

Therefore

moles of N in Cu(NO3)2= 0.054mol *2

moles of N in Cu(NO3)2=0.109mol

Hence

atoms of Nitrogen N

aN=0.109*6.022 x20^23

aN=6.55x10^22 atoms of N

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