Question

What is the mass of 18.8 moles of helium (He) atoms

Answer 1

Mass = 18.8 g × 4.00/mol = 75.2 g

Answer 2

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 :

$\text{Mass of helium atom}=\text{Moles of helium atom}\times \text{Molar mass of helium atom}$

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

$\text{Mass of helium atom}=18.8mole\times 4g/mole$

$\text{Mass of helium atom}=75.2g$

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