H2(g)+I2(s)→HI(s)H2(g)+I2(s)→HI(s) balance equations

H2(g)+I2(s)→2HI(s)

Explanation:

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In this case, according to the given information and unbalanced chemical reaction, we infer it must be balanced in agreement with the law of conservation of mass because the reactants side has two hydrogen and iodine atoms whereas the products side has just one. In such a way, by placing a 2 on HI, we obtain the following balanced reaction:

H2(g)+I2(s)→2HI(s)

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