Question

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

Answer 1

C. 49.2 g He

Step-by-step explanation:

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Answer 2

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}* \text{Molar mass of helium}`

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

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