Posted by lucy on Thursday, August 9, 2012 at 3:09am.
2KClO3 ==> 2KCl + 3O2
Convert 30g KClO3 to mols. mols = grams/molar mass.
Using the coefficients in the balanced equation, convert mols KClO3 to mols O2.
2H2 + O2 ==> 2H2O
Using the coefficients in the H2O equation, convert mols O2 from KClO3 reaction to mols H2.
Zn + 2HCl ==> ZnCl2 + H2
Using the coefficient in the Zn equation, convert mols H2 from the H2O equation to mols Zn.
You want to know grams Zn; therefore mols Zn x atomic mass Zn = grams Zn.
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