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JAMB Chemistry 2021 Paper

Question : 20

Total: 40

The mass of one Avogadro number of helium atoms is?

Solution:

Concept:

One Avogadro number of atoms represents one mole of a substance.

Explanation:

Avogadro's number is

6.022 \times 10^{23}

particles per mole.

Thus, one Avogadro number of helium atoms is exactly

1

mole of helium.

Helium has a molar mass of

4.00

grams per mole.

Therefore, the mass of one mole of helium atoms is

4.00

grams.

Answer:

4.00

gram

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