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Your question is not clear: the mass of products is equal to the mass reactants.
The Question's last part is not precisely stated, but an answer could be something like this:ZnCO3 ==> ZnO + CO2 ................followed by:2 ZnO + C ==> 2 Zn + CO2 ..........giving the overall reaction:2 ZnCO3 + C 2 Zn + 3 CO2 ..in which ZnO is balanced out.
fe+3=..............* .9 =fe+2
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i just know it because its in the 2nd group therefore is has 2 plus charge it also looses 2 electrons
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12 blackdrago98's answer: If the question is: "What is the answer to '2 plus 2 plus 4'?" then it is 8. If the question is: "What is the answer: 2(2+2+4)?"
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