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Acid Base Reaction and Oxidation Numbers

1) Pennies made after 1982 contain 97% zinc by mass. A student wants to prove this by filing the copper outside the penny until he sees zinc and then putting the penny in a 1.00 M HCl solution. The zinc will be oxidized and the H+ (from the HCl) will be reduced:
Zn + 2H+ ----- Zn2+ + H2
If the entire penny has amass of 2.80 grams, how many ml of 1.00 M HCl are required to just react with all the zinc? ( You would, in reality, add much more to completely surround the penny)

2) Determine the oxidation number for each atom in the following compounds:
a.) MgBr2 c.) Cr2O7 e.) NaClF4
b.) Na2SO4 d.) CaCO3 f.) HNO3

Solution Summary

Word document showing the calculations around the reaction of zinc in a penny and finding the oxidation numbers of 6 compounds.