Question

be produced by combining ethyne (c₂h₂) and hydrogen chloride (hcl).
which model accurately represents this reaction?
h c cl

Explanation:

Step1: Count atoms in reactants

Ethyne \(C_2H_2\) has 2 C and 2 H per molecule. Hydrogen chloride \(HCl\) has 1 H and 1 Cl per molecule.

Step2: Count atoms in products

Check if the number of each type of atom (C, H, Cl) on the reactant side equals that on the product side.
For the correct model, the number of \(C_2H_2\) molecules and \(HCl\) molecules should combine such that atom counts match.

Answer:

The second model (with one \(C_2H_2\) molecule and two \(HCl\) molecules as reactants) is correct. Because the chemical reaction \(C_2H_2 + 2HCl
ightarrow C_2H_3Cl + C_2H_3Cl\) (vinyl chloride formation, simplified here for atom - counting) requires stoichiometry where for each \(C_2H_2\), two \(HCl\) are needed to balance atoms (2 C, (2 + 2) H = 4 H, 2 Cl on reactant side; 2 C, 3 + 1 = 4 H, 2 Cl on product side for two \(C_2H_3Cl\) units).