Question

Which of the following has smallest mass 4g of He. 1 atom of He. 1 Mole atoms of He. 6.022*10*23 atoms of He

Answer 1

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Answer 2

Answer:

The correct answer is- 1 atom of $He$.

Explanation:

• Mass 1 atom of $He$-

When can get the mass of 1 $He$ atom by dividing the atomic mass by the Avogadro constant ( $6.02 * 10^{23}$ ).

The atomic mass of $He$ is 4.

Mass of one mass of $He$- $\frac{4}{6.02 * 10^{23} }$

= $6.45 * 10^{-24}g$ is the mass of only one helium atom.

• 1 Mole of atoms of $He$ and $6.022 * 10^{23}$ atoms of $He$.

Both have the same amount of helium atoms and weigh the same, that is $4g$.

Conclusion:

One atom of $He$ has the smallest mass.