The Purity of a Sample Containing Zinc and Weighing 0

question 105

Multiple Choice

The purity of a sample containing zinc and weighing 0.198 g is determined by measuring the amount of hydrogen formed when the sample reacts with an excess of hydrochloric acid. The determination shows the sample to be 84.0% zinc. What amount of hydrogen (measured at STP) was obtained?

• A) 1.53  10²¹ atoms
• B) 3.42  10^-3 mol
• C) 0.152 L
• D) 0.0330 g
• E) 1.53  10²¹ molecules