Question

No. Of molecules in 4.25 g of nh3 is approx.

Answer 1

No of molecule =weight in grams /mwt of it
=4.25÷17
=0.25

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.