Calculate the mass of 1.23×1024 helium atoms. express your answer in grams of helium.

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Question:

Calculate the mass of 1.23×1024 helium atoms. express your answer in grams of helium.

Answer:

The mass of ?f=%5Crm%201 atoms of He is 8.16 grams.

According to the mole concept,

6.023 ?f=%5Crm%20%5Ctimes%5C%3B10%5E2%5E3 atoms = 1 mole

From the question,

?f=%5Crm%201 atoms = ?f=%5Crm%20%5Cfrac%7B1.23%5C%3B%5Ctimes%5C%3B10%5E2%5E4%7D%7B6 moles

?f=%5Crm%201 atoms = 2.04 moles

Mole = ?f=%5Crm%20%5Cfrac%7Bweight%7D%7Bmolecular%5C%3Bweight%7D

weight = moles ?f=%5Ctimes molecular weight

Mass of 2.04 moles of He atoms = 2.04 ?f=%5Ctimes 4

Mass of 2.04 moles of He atoms is 8.16 grams.

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