Question

the number of molecules in 4.25 g of NH3 is

Answer 1

No of moles = Given mass/Molecular mass
=4.25/14+3(Molecular mass of NH3 is 17)
=4.25/17
=0.25 mol
No. of molecules in 1 mole NH3 is 6.022x10^23
Therefore in 0.25 mole it is= 6.022x10^23/0.25
=1.5055x10^23 molecules
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Answer 2

$\Huge\purple{\mathfrak{\underline{\underline{Solution}}}}$

→ Molar mass NH3 = 14+3 = 17g/mol

→ 4.25g = 4.25/17 = 0.25 mol NH3

→ 1mol = 6.022× 10²³ molecules

→ 0.25 mol = 0.25×6.022×10²³

→ Number of molecules = 1.51×10²³ molecules NH3.