The Purity of a Sample Containing Zinc and Weighing 0

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