Question

number of molecules in 4.25 gram of ammonia are

Answer 1

Hey mate.....
Here is your answer....

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Molar mass of ammonia is 17g . So 17g ammonia contains 6.022×10^23 number of ammonia molecules. So 4.25 g ammonia will contain (6.022×10^23×4.25)/17 = 1.5×10^23 number of ammonia molecules.

Molar mass of NH3 = 14+3= 17g/mol
mass given= 4.25g
so, number of moles = 4.25/17 = 0.25mol of NH3

1 mol of NH3 has 6.022 x 10^{23}10
23
molecules

0.25 moles of NH3 contains 0.25 x 6.022 x 10^{23}10
23
molecules
= 1.5055 x 10^{23}10
23
molecules

1.5×10^23

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Answer 2

hey mate here is your answer....

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

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