Question

Calculate the mass of 3.01×10²³ molecules of potassium chloride

Answer 1

No. of molecules of the Ammonia = 3.01 × 10²³

Molar Mass of the Ammonia = 17 g/mole.

Using the Formula,

No. of Molecules = Mass/Molar Mass × Avogadro's Number.

⇒ 3.01 × 10²³ = Mass/17 × 6.022 × 10²³

⇒ Mass = 17/2

∴ Mass = 8.5 g.

Hence, the Mass of the Ammonia is 8.5 g.

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Answer 2

Find for one molecule , then multiply with the number of molecules that you need