Calculate how much 38g of fluoride will take.

Given:
m (F2) = 38 g
To find:
V (F2)
Decision:
n (F2) = m (F2) / M (F2) = 38 g / 38 g / mol = 1 mol
V (F2) = n (F2) * Vm = 1 mol * 22.4 L / mol = 22.4 L
Answer: 22.4 L



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