Question

helium gas consists of single atom.what mass of helium contains 6.022*10^23 atoms?

Answer 1

$6.022 \times {10}^{23}$

atoms means 1 mole of He.

Therefore,

Mass of helium = Molar mass = 4 grams.

Answer 2

Answer: 4 g

Explanation: According to Avogadro's law, 1 mole of every substance contains Avogadro's number of particles $(6.023\times 10^{23}$ and weighs equal to its molecular mass.

Thus 1 mole atom of Helium $He$ contains= $6.023\times 10^{23}$  atoms of Helium

$6.023\times 10^{23}$  atoms of Helium weigh = 4 g.