killjoy1990xb9

2022-01-06

Use Avogadro’s number to find the mass of a helium atom.

Annie Gonzalez

Beginner2022-01-07Added 41 answers

Step 1

Avogardo's number is

The mass M of one mole of a pure substance in grams is the same, numerically, as that substance's atomic (or molecular) mass.

The mass of a single molecule is then

Use the table in Appendix B:

For helium,

So, the mass of a helium molecule is

Step 2

Since a helium molecule contains a single helium atom,

the mass of a helium atom is

Debbie Moore

Beginner2022-01-08Added 43 answers

One mole of helium contains Avogadro's number of molecules and has a mass of 4.00g. Let us call

or

22+64

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