1.802molS
This is found by using the conversion factor: 1mol/32.07gS. This factor can be used to convert from grams of sulfur (given in the problem) to moles of sulfur. To use this conversion factor, divide 57.8gS by 32.07gS to find the number of moles of sulfur: 57.8gS / 32.07gS = 1.802molS.