Respuesta :

Answer;

2 g

Explanation;

Moles of atom =  atoms / 6.022 × 10^23  

Therefore; number of moles;

=(3.01 ×10^23) / (6.022 × 10^23)

= 0.5 moles

But;

Mass = moles of atom × Molar Mass of Helium  

Thus total mass of helium:

= 0.5 × 4

= 2 g

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