estvega1717 estvega1717

19-12-2020
Chemistry

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A balloon contains 12.1 L of helium gas at STP. What is the mass in grams of He in the balloon?

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raduoprea160 raduoprea160

19-12-2020

Answer:\

1.08 grams

Explanation:

first, we need to find the number of moles

we divide 12.1/22.4=0.54 moles

we multiply the number of moles with the molecular mass 0.54x2=1.08g

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