Math Problem Statement

A 74.0 mL solution of 0.200 M of AgNO₃ reacts with 195.0 mL solution of 0.351 M of NaCl to produce silver chloride (AgCl) and sodium nitrate (NaNO₃) according to the balanced equation: AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq). Determine the limiting reactant for the given reaction. Calculate the mass of AgCl produced in the reaction and the percent yield if 0.770 g of AgCl are isolated after carrying out the reaction.

Solution

Let's break down the problem step by step:

Step 1: Determine the limiting reactant

The balanced chemical equation is: AgNO3(aq)+NaCl(aq)AgCl(s)+NaNO3(aq)\text{AgNO}_3(aq) + \text{NaCl}(aq) \rightarrow \text{AgCl}(s) + \text{NaNO}_3(aq)

We are given:

  • Volume of AgNO₃ solution = 74.0 mL (or 0.074 L)
  • Molarity of AgNO₃ = 0.200 M
  • Volume of NaCl solution = 195.0 mL (or 0.195 L)
  • Molarity of NaCl = 0.351 M
  1. Calculate the moles of AgNO₃: Moles of AgNO3=Molarity×Volume\text{Moles of AgNO}_3 = Molarity \times Volume Moles of AgNO3=0.200M×0.074L=0.0148mol\text{Moles of AgNO}_3 = 0.200 \, \text{M} \times 0.074 \, \text{L} = 0.0148 \, \text{mol}

  2. Calculate the moles of NaCl: Moles of NaCl=Molarity×Volume\text{Moles of NaCl} = Molarity \times Volume Moles of NaCl=0.351M×0.195L=0.068445mol\text{Moles of NaCl} = 0.351 \, \text{M} \times 0.195 \, \text{L} = 0.068445 \, \text{mol}

Step 2: Determine the limiting reactant

The reaction is 1:1, meaning one mole of AgNO₃ reacts with one mole of NaCl. Since we have fewer moles of AgNO₃ (0.0148 mol) than NaCl (0.068445 mol), AgNO₃ is the limiting reactant.

Step 3: Calculate the mass of AgCl produced

From the balanced equation, 1 mole of AgNO₃ produces 1 mole of AgCl. Thus, the moles of AgCl produced will be the same as the moles of AgNO₃ used, which is 0.0148 mol.

Now, calculate the mass of AgCl using its molar mass:

  • Molar mass of AgCl = 107.87 g/mol (Ag) + 35.45 g/mol (Cl) = 143.32 g/mol

Mass of AgCl=Moles of AgCl×Molar mass of AgCl\text{Mass of AgCl} = \text{Moles of AgCl} \times \text{Molar mass of AgCl} Mass of AgCl=0.0148mol×143.32g/mol=2.1211g\text{Mass of AgCl} = 0.0148 \, \text{mol} \times 143.32 \, \text{g/mol} = 2.1211 \, \text{g}

So, the theoretical mass of AgCl produced is 2.1211 g.

Step 4: Calculate the percent yield

The actual yield of AgCl is given as 0.770 g. The percent yield is calculated as:

Percent yield=(Actual yieldTheoretical yield)×100\text{Percent yield} = \left( \frac{\text{Actual yield}}{\text{Theoretical yield}} \right) \times 100 Percent yield=(0.770g2.1211g)×100=36.29%\text{Percent yield} = \left( \frac{0.770 \, \text{g}}{2.1211 \, \text{g}} \right) \times 100 = 36.29\%

Thus, the percent yield of AgCl is 36.29%.


Summary of answers:

  • Limiting reactant: AgNO₃
  • Mass of AgCl produced: 2.1211 g
  • Percent yield: 36.29%

Would you like more details on any of these steps? Here are some related questions to deepen your understanding:

  1. How would the calculation change if NaCl were the limiting reactant?
  2. What factors could lead to a low percent yield in a chemical reaction?
  3. How do you calculate the molarity of a solution?
  4. Why is it important to know the limiting reactant in a reaction?
  5. How can you improve the yield of a reaction in a laboratory setting?

Tip: Always check that your units are consistent when performing calculations in chemistry, especially between mL and L for volume and M for molarity.

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Math Problem Analysis

Mathematical Concepts

Stoichiometry
Limiting Reactant
Percent Yield

Formulas

Moles = Molarity × Volume
Mass = Moles × Molar Mass
Percent Yield = (Actual Yield / Theoretical Yield) × 100

Theorems

Law of Conservation of Mass

Suitable Grade Level

Grades 10-12