An impure sample of zinc (Zn) is treated with an excess of sulfuric acid (H2SO4) to form zinc sulfate (ZnSO4) and molecular hydrogen (H2).
(a) Write a balanced equation for the reaction.
Zn(s) + →
(b) How many moles are in 3.70 g of pure zinc?
_ mol
(c) How many moles of hydrogen gas are formed if one mole of zinc is treated with excess sulfuric acid?
_mol
(d) If 3.70 g of pure Zn is treated with excess sulfuric acid, how many grams of hydrogen could be collected?
_ g
(e) If 0.0660 g of H2 is obtained from 3.70 g of impure sample, what is the percent purity of the sample?
_ %
Answers: 1
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