Question

5
select the correct answer.
when hydrochloric acid reacts with sodium sulfide, hydrogen sulfide gas and sodium chloride are produced. how many moles of h₂s will be generated by 2.56 moles of hcl?
2hcl + na₂s → h₂s + 2nacl
○ a. 1.28 moles
○ b. 2.56 moles
○ c. 5.12 moles
○ d. 5.56 moles

Explanation:

Step1: Analyze the mole ratio

From the balanced chemical equation \(2HCl + Na_2S
ightarrow H_2S + 2NaCl\), the mole ratio of \(HCl\) to \(H_2S\) is \(2:1\).

Step2: Calculate the moles of \(H_2S\)

Let \(n_{H_2S}\) be the moles of \(H_2S\). Using the mole - ratio formula \(n_{H_2S}=\frac{1}{2}\times n_{HCl}\). Given \(n_{HCl} = 2.56\) moles. Then \(n_{H_2S}=\frac{2.56}{2}\) moles.

Answer:

A. 1.28 moles