The molar mass of sulfur (S) is 32.065 grams per mole. To determine the number of moles in 300 grams of sulfur, we can use the formula:

$$Moles = \frac{Mass}{Molar \ Mass}$$

Substituting the given values into the formula, we get:

$$Moles = \frac{300 \ g}{32.065 \ g/mol} = 9.355 \ mol$$

Therefore, there are approximately 9.355 moles in 300 grams of sulfur.