Exhibit 3-2 Aluminum Sulfide, Al₂S₃ (Molar Mass = 150

Exhibit 3-2 Aluminum sulfide, Al₂S₃ (molar mass = 150.16 g/mol) , reacts with water to form the aluminum hydroxide, Al(OH) ₃ (molar mass = 78.00 g/mol) , and hydrogen sulfide, H₂S, as shown below:
__ Al₂S₃ + __ H₂O→__ Al(OH) ₃ + __ H₂S (unbalanced reaction)
Refer to Exhibit 3-2. How many molecules of H₂S are prepared from 10.5 g of Al₂S₃?

A) 8.72×10 ^{- 22} H₂S molecules
B) 1.40×10²² H₂S molecules
C) 4.21×10²² molecule of H₂S
D) 1.26×10²³ H₂S molecules
E) 1.81×10²⁴ H₂S molecules