Question

hydrogen chloride is often used to help make a material found in plastic water pipes. it is produced when hydrogen gas and chlorine gas are mixed and heated.

consider the following reaction:

2 molecules of hydrogen (h₂) react with 2 molecules of chlorine (cl₂) to produce some amount of hydrogen chloride (hcl).

complete the table below.

chemical element	number of atoms in the reaction
cl	□

during this reaction, how many molecules of hydrogen chloride (hcl) are produced?

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Explanation:

For the number of H atoms:

Step1: Analyze H₂ molecules

Each \( H_2 \) molecule has 2 H atoms. There are 2 \( H_2 \) molecules. So total H atoms: \( 2\times2 = 4 \).

Step2: Confirm conservation (optional)

In a chemical reaction, atoms are conserved. So H atoms in reactants = H atoms in products. So H atoms: 4.

For the number of Cl atoms:

Step1: Analyze \( Cl_2 \) molecules

Each \( Cl_2 \) molecule has 2 Cl atoms. There are 2 \( Cl_2 \) molecules. So total Cl atoms: \( 2\times2 = 4 \).

Step2: Confirm conservation (optional)

Cl atoms in reactants = Cl atoms in products. So Cl atoms: 4.

For the number of HCl molecules:

Step1: Use atom conservation

Each HCl has 1 H and 1 Cl atom. Total H atoms: 4, so HCl from H: 4. Total Cl atoms: 4, so HCl from Cl: 4. Thus, HCl molecules: 4.

Answer:

s:

• Number of H atoms: \( \boldsymbol{4} \)
• Number of Cl atoms: \( \boldsymbol{4} \)
• Number of HCl molecules: \( \boldsymbol{4} \)