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Question

What is the mass of 3.01×1023 molecules of ammonia?

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Solution

No. of molecules of the Ammonia =3.01×1023

Molar Mass of the Ammonia =17g/mole.
Using the Formula,
No. of Molecules =Mass/Molar Mass×Avogadros Number.

3.01×1023=Mass/17×6.022×1023

Mass=172

Mass=8.5 g.

Hence, the Mass of the Ammonia is 8.5 g.

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