a) How many grams of hydrochloric acid are required to react completely with 4.30 grams of zinc?
b) How many molecules of a gas will be produced?
Answer:
a) The reaction is :
Zn + 2 HCl >> ZnCl2 + H2
Moles of Zn = 4.30 / 65.37 g/mol = 0.0658
The ratio between Zn and HCl is 1 : 2 so are required
2 x 0.0658 = 0.132 moles HCl
Molecular weight of Hcl = 36.45 g/mol
0.132 x 36.45 = 4.81 g
b) 0.0658 moles H2 will be produced
0.0658 x 6.02 x10^23 = 3.96 x 10^22 molecules of H2
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