When small quantities of elemental hydrogen gas are needed for laboratory work, the
Chapter 9, Problem 86(choose chapter or problem)
When small quantities of elemental hydrogen gas are needed for laboratory work, the hydrogen is often generated by chemical reaction of a metal with acid. For example, zinc reacts with hydrochloric acid, releasing gaseous elemental hydrogen: Zn(s) _ 2HCl(aq) S ZnCl2(aq) _ H2(g) What mass of hydrogen gas is produced when 2.50 g of zinc is reacted with excess aqueous hydrochloric acid?
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