Answer :

mass = 18.8 g × 4.00/mol = 75.2 g

Answer : The mass of 18.8 moles of helium atoms are, 75.2 grams

Explanation : Given,

Moles of helium atom = 18.8 moles

Molar mass of helium atom = 4 g/mole

Formula used :

[tex]\text{Mass of helium atom}=\text{Moles of helium atom}\times \text{Molar mass of helium atom}[/tex]

Now put all the given values in this formula, we get the mass of helium atom.

[tex]\text{Mass of helium atom}=18.8mole\times 4g/mole[/tex]

[tex]\text{Mass of helium atom}=75.2g[/tex]

Therefore, the mass of 18.8 moles of helium atoms are, 75.2 grams

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