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 H2(g).
The H2(g) produced
has a volume of 112 milliliters and a pressure of 1.00
atmosphere at 298 K.
65 The volume of the piece of Mg(s) is
expressed to what number of significant figures? 
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66 In the space
in your answer
booklet, show a correct numerical setup for
calculating the volume of the H2(g)
produced if the conditions are changed to STP. 
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