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To find the number of molecules in 39.0 liters of F₂ gas at standard temperature and pressure (STP), we can use Avogadro's law, which states that 1 mole of any gas occupies 22.4 liters at STP. First, we calculate the number of moles in 39.0 liters:

( \text{Moles of F₂} = \frac{39.0 , \text{L}}{22.4 , \text{L/mol}} \approx 1.74 , \text{mol} ).

Next, we convert moles to molecules using Avogadro's number ((6.022 \times 10^{23} , \text{molecules/mol})):

( 1.74 , \text{mol} \times 6.022 \times 10^{23} , \text{molecules/mol} \approx 1.05 \times 10^{24} , \text{molecules} ).

Thus, there are approximately (1.05 \times 10^{24}) molecules of F₂ gas in 39.0 liters at STP.

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