What are the coefficients in front of Fe( s ) and O 3 ( g ) when the following e

Question

What are the coefficients in front of Fe(s) and O3(g) when the following equation is balanced in a basic solution:

___ Fe(s) + ___ O3(g) %u2192 ___ Fe2O3(s) + ___ O2(g)?

Answer is : 2,3 but I need to know how to do this!

Determine the number of water molecules necessary to balance the following chemical equation

Cr2O72-(aq) + Cl-(aq) + H+(aq) %u2192 Cr3+(aq) + Cl2(g) + ___ H2O(l).

Answer is 7 but how?

Determine the number of water molecules necessary to balance the reduction half reaction of ___ MnO4-(aq) %u2192 ___ MnO2(s) that occurs in a basic solution.

Answer is 2 but how??

Explanation / Answer

1.) 2Fe(s) + 3O3(g) ----> Fe2O3(s) +3O2(g)

2.)2Cr2O72-(aq) + 2Cl-(aq) + 14H+(aq)--->2Cr3+(aq) + Cl2(g) + 7H2O(l).

7 moles are required to balance the reaction

3.)MnO4-(aq)+4H+----->MnO2(s)+2H2O ans

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