What volume of hydrogen at STP is produced when 2.5 g of zinc react with an excess of hydrochloric acid in the reaction #Zn + 2HCl -> ZnCl_2 + H_2#?

1 Answer
Feb 28, 2016

Answer:

#0.86 "L"#

Explanation:

#1 "mol"# of #"Zn"# has mass of #65.39 "g"#.

The amount of #"Zn"# is #frac{2.5 "g"}{65.39 "g/mol"} = 0.038 "mol"#.

The amount of #"H"_2# produced is the same as the amount of #"Zn"# consumed #(0.038 "mol")#.

#1 "mol"# of ideal gas will occupy #22.4 "L"# at STP.

The #"H"_2# will occupy #0.038 "mol" xx 22.4 "L/mol" = 0.86 "L"#.