Question

What is the mass of 12.3 moles of helium (He)?

Answer 1

Answer : The mass of 12.3 moles of helium (He) is, 49.2 grams.

Solution : Given,

Moles of helium = 12.3 moles

Molar mass of helium = 4 g/mole

Formula used :

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

$\text{Mass of helium}=(12.3mole)\times (4g/mole)=49.2g$

Therefore, the mass of 12.3 moles of helium (He) is, 49.2 grams.