Mercury occurs as a sulfide ore called cinnabar, HgS. How many moles of HgS are contained in a sample that weighs 172.5 grams? Be sure to include a unit with your answer.
Molecular weight of HgS is 232.66 g/mol
Weight of HgS sample is 172.5 g
Number of moles of HgS = weight of the HgS sample / molecular weight of HgS
= 172.5 g / 232.66 g/mol = 0.74 mol
Mercury occurs as a sulfide ore called cinnabar, HgS. How many moles of HgS are contained...