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Originally Posted by sarahswaheli
"The properties of a chemical compound are the averages of the elements that make up the compound" Is this true?
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No, it is blatantly wrong.
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Also, what is the simplest formula for zinc iodide?
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Zn is bivalent, iodine in iodides is monovalent (to be more precise they both form ions, Zn2+ and I-).
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The mass of the products do not equal the mass of the reactants, is that because iodine is the limiting reagent?
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Mass of products is always equal to mass of reactants - but in case of limiting reagent not all reactants were used. What was a limiting reagent depends on the starting masses of zinc and iodine. It may also happen that there are some losses during reaction.
Best,
Borek