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Answer:4.25 g ammonia will contain (6.022×10^23×4.25)/17 = 1.5×10^23 number of ammonia molecules.
Explanation: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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Molecular mass of NH3 is 17g.
moles of NH3 = 4.25/17
= 0.25
No. of molecules = 0.25× 6.02× 10²³
= 1.505×10²³
No. of atoms in NH3 = 4×1.505×10²³
= 6× 10²³. (approx)
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