Number of atoms in 4.25 g of NH3is approximatly............

 Molar mass NH3 = 14+3 = 17g/mol
given mass = 4.25g

no of moles = 4.25/17 = 0.25 mol of NH3

1 mol of NH3 contains  6.022*10^23  molecules
0.25 mol NH3 contains  0.25*6.022*10^23  = 1.5055*10^23 molecules

1 molecule of NH3 contains 4 atoms
Number of atoms in 1.5055*10^23 molecules = 4*1.5055*10^23 atoms.

The correct answer is = 6.022*10^23 atoms.

  • 81

 Molar mass NH3 = 14+3 = 17g/mol 

given mass = 4.25g

no of moles = 4.25/17 = 0.25 mol of NH3 

1 mol of NH3 contains 6.022*10^23 molecules 
0.25 mol NH3 contains 0.25*6.022*10^23 = 1.5*10^23 molecules 

1 molecule of NH3 contains 4 atoms 
Number of atoms in 1.5*10^23 molecules =  4*1.5*10^23 atoms. 
= 6*10^23 atoms 
 

The correct answer is = 6*10^23 atoms.

  • 18

 thanxx 4 d ans.

  • -13
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