Observe the following balanced chemical reaction:
2 fe + 3 cl2 → 2 fecl3
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which of the following describes the mole ratio between fe and cl2?
2 mol fe: 2 mol cl2
1 mole fe: 2 mole cl2
2 mole fe: 6 mol cl2
2 mole fe : 3 mol cl2

The answer to your question is: the last option ( 2 mole Fe : 3 mol Cl2)

Explanation:

The mole ratio in a chemical reaction is expressed by the integers before each element, for example if we have

                                                           2H2SO4 + 3NaOH,

The mole ratio between, H2SO4 and NaOH is 2H2SO4 : 3 NaOH

In your question, the question is the ratio between Fe and Cl2, so we look at their coefficients and then:

                    2 mole Fe : 3 mol Cl2

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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a:

by the combination of an unlimited number of elements