Question

The number of atoms in 4.25g of NH3 is approx

Answer 1

So 4.25 g ammonia will contain (6.022×10^23×4.25)/17 = 1.5×10^23 number of ammonia molecules. Each molecule contain 4 atoms (1 N atom and 3 H atoms). So 4.25g ammonia will contain 1.5×10^23×4 = 6×10^23 number of atoms.
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Answer 2

no of moles = given mass/ molar mass

molar mass of NH3 = 14+(1*3)=17

given mass = 4.25gm

therefore no of moles = 4.25/17=0.25mol

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