Hydrochloric acid and sodium sulfide are mixed and totally react to form hydrogen sulfide and sodium chloride.

Write the chemical equation of this reaction.

How many grams of hydrogen sulfide are produced from 5.0 mol of both hydrochloric acid and sodium sulfide?

Question

Hydrochloric acid and sodium sulfide are mixed and totally react to form hydrogen sulfide and sodium chloride.

Write the chemical equation of this reaction.

How many grams of hydrogen sulfide are produced from 5.0 mol of both hydrochloric acid and sodium sulfide?

| General Chemistry 1

Accepted Answer

2 HCl(aq) + Na₂S(aq) → H₂S(g) + 2 NaCl(aq)

We have to determine the limiting reactant:

- if HCl is the limiting reactant: at t_final, n_HCl – 2x₁ = 0 ⇒ x₁ = 2.5 mol

- if Na₂S is the limiting reactant: at t_final, n_Na2S – x₂ = 0 ⇒ x₂= 5.0 mol

x₁ < x₂ so HCl is the limiting reactant and n_H2S = x₁ = 2.5 mol

n_H2S = $\frac{m_{H 2 S}}{M_{H 2 S}}$ ⇒ m_H2S = n_H2S x M_H2S = 85 g

Midterm 1 - Question 1 | General Chemistry 1