Reaction 4

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The figure on the left represents one set chlorine (green) and hydrogen (white) molecules. The figure on the right shows the result of the reaction between these species.

 

 

Which of the following equations best represents the chemical reaction taking place?

10 H + 10 Cl → 10 HCl	WRONG. The two species are diatomic molecules. The lowest stoichiometric coefficients should be used.
H + Cl → HCl	Wrong. The two species are diatomic molecules.
H2 + Cl2 → 2 HCl	Right. One molecule of hydrogen reacts with one molecule of chlorine to form two molecules of HCl.
5 H2 + 8 Cl2 → 10 HCl + 3 Cl2	Wrong. Reagents not correspond to what is shown in the Figure.

 

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