Which of the following has smallest mass ?

Foundation

Chemistry Foundation

Mole Concept and Calculation

Question

All have equal mass

6.022 x 10²³ atoms of He

1 mole atoms of He

1 atom of He

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1 mole atoms or 6.022 × 10²³ atoms of.
He has mass = 4 g
But mass of 1 atom of $He = \frac{4}{6 .023 \times 10^{23}} g$
so 1 atom of He has smallest mass.