The Mineral Orpiment, Having the Empirical Formula As₂S₃, Was Used

question 43

Multiple Choice

The mineral orpiment, having the empirical formula As₂S₃, was used in ancient times as a cosmetic. What mass of arsenic is present in 5.0 g of orpiment [Given: naturally occurring arsenic is all arsenic-75; assume that all naturally occurring sulfur is sulfur-32 (only approximately true) ]

• A) 0.61 g
• B) 3.0 g
• C) 1.5 g
• D) 2.0 g
• E) 3.5 g