An ionic compound forms when calcium reacts with iodine. If the sample contains 7.4 xx 10^21 calcium ions, how many iodide ions does it contain?

1 Answer
anor277
Sep 5, 2016

It must contain 14.8xx10^21 iodide ions.

Explanation:

Calcium metal has 2 valence electrons. It readily forms a Ca^(2+) ion. Because iodine readily forms a uninegative ion, I^-, a neutral salt will form with composition CaI_2.

Is the following a redox reaction?

Ca(g) + I_2(g) rarr CaI_2(s)

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