How many moles are present in 40g of Helium (He)?

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• A 5 moles
• B 20 moles
• C 6 moles
• D 10 moles

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Answer: D. 10 moles

The molar mass of helium (He) is 4 g/mol.
Number of moles = mass / molar mass = 40 / 4 = 10 moles.

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