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A balloon contains 8.4 L of helium gas at STP. How many moles of helium are in the balloon? 0.38 moles He ,190 moles He ,2.1 moles He ,8.4 moles He

Respuesta :

Answer:

0.38 moles He

Explanation:

from the  ideal gas law PV= nRT you can calculate the volume of 1 mole at STP (273..1K  and 1 atm of pressure)  the MOLAR VOLUME IS

22.4 L

In the problem you have 8.4L

8.4 L/22.4 L=0.375 moles

so

0.38 moles He

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