Base your answer to the question on the information below. The balanced equation below represents the reaction between magnesium metal and hydrochloric acid to produce aqueous magnesium chloride and hydrogen gas.
Mg(s) + 2HCl(aq) - MgCl2(aq) + H2(g)
A piece of Mg(s) has a volume of 0.0640 cubic centimeters. This piece of Mg(s) reacts completely with HCl(aq) to produce Hz(9). The Hz(9) produced has a
volume of 112 milliliters and a pressure of 1.00 atmosphere at 298 K
The volume of the piece of Mg(s) is expressed to what number of significant figures?