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Monica [59]
2 years ago
8

A balloon contains 8.4 L of helium gas at STP. How many moles of helium are in the balloon?

Chemistry
1 answer:
ozzi2 years ago
3 0

Answer:

0.38\ \text{moles of He}

Explanation:

\rho = Density of helium at stp = 0.179 g/L

M = Molar mass of helium = 4 g/mol

V = Volume of helium = 8.4 L

Mass of helium

m=\rho V\\\Rightarrow m=0.179\times 8.4\\\Rightarrow m=1.5036\ \text{g}

Number of moles is given by

n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{1.5036}{4}\\\Rightarrow n=0.3759\approx0.38\ \text{moles of He}

The number of moles of helium in the balloon is 0.38\ \text{moles}

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