When hydrogen sulfide gas is bubbled into a solution of sodium hydroxide, the reaction forms sodium sulfide and water. How many grams of sodium sulfide are formed if 1.25 g of hydrogen sulfide is bubbled into a solution containing 2.00 g of sodium hydroxide, assuming that the sodium sulfide is made in 92.0% yield?

Verified step by step guidance

1. First, write down the balanced chemical equation for the reaction. Hydrogen sulfide (H2S) reacts with sodium hydroxide (NaOH) to form sodium sulfide (Na2S) and water (H2O). The balanced equation is: 2NaOH + H2S -> Na2S + 2H2O
2. Next, calculate the number of moles of H2S and NaOH using their respective molar masses. The molar mass of H2S is approximately 34.08 g/mol and the molar mass of NaOH is approximately 40.00 g/mol. Use the formula: number of moles = mass / molar mass.
3. Then, determine the limiting reactant. This is the reactant that will be completely consumed first in the reaction. Compare the mole ratio of H2S to NaOH in the balanced equation with the ratio of the number of moles you calculated in the previous step.
4. Once you have identified the limiting reactant, you can calculate the theoretical yield of Na2S. This is the maximum amount of Na2S that can be produced from the limiting reactant. Use the stoichiometry of the balanced equation to do this.
5. Finally, calculate the actual yield of Na2S using the percent yield given in the problem. The actual yield is the amount of product that is actually formed in a reaction. It is given by the formula: actual yield = theoretical yield * (percent yield / 100).

Key Concepts

Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced chemical equation. It allows us to determine the amount of product formed from a given amount of reactant by using mole ratios derived from the coefficients in the balanced equation.

Percent Yield

Percent yield is a measure of the efficiency of a chemical reaction, calculated as the ratio of the actual yield to the theoretical yield, multiplied by 100. It indicates how much of the expected product was actually obtained, which is crucial for understanding the effectiveness of the reaction under given conditions.

Limiting Reactant

The limiting reactant is the substance that is completely consumed first in a chemical reaction, thus determining the maximum amount of product that can be formed. Identifying the limiting reactant is essential for accurate stoichiometric calculations, as it dictates the extent of the reaction and the yield of the product.