Question

A chemist measures the amount of fluorine gas produced during an experiment. she finds that 76.9 g of fluorine gas is produced. calculate the number of moles of fluorine gas produced.

Answer 1

From the periodic table:
The molecular weight of fluorine = 18.99 grams

Since the formula of fluorine is F2, therefore,
molar mass of fluorine = 2 x 18.99 = 37.98 grams

Now, we can calculate the number of moles in 76.9 grams using the following rule:
number of moles = mass / molar mass = 76.9 / 37.98
= 2.0247 moles