Question

В лаборатории из 120 л ацитилена (н.у.) получили 60 г бензола. Сколько % это составляет от теоретического возможного выхода?

Answer 1

Дано
V(C2H2)=120 L
m(практ C2H6)=60 g
-----------------------
η-?
    120          X
3C2H2-->C6H6 Vm=22.4 L/mol M(C6H6)=78 g/mol
  3*22.4        78
X=120*78 / 67.2
X=139.3 g
η = m(практ)/m(теор)*100% = 60/139.3 *100%=43.07%
ответ 43.07%

Answer 2

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Answer 3

Calculating the Percentage Yield of Benzene from Acetylene

To calculate the percentage yield of benzene from acetylene, we can use the formula:

Percentage Yield = (Actual Yield / Theoretical Yield) * 100%

Given: - Actual Yield of Benzene = 60 g - Initial amount of Acetylene = 120 L

Using the provided information, we can calculate the percentage yield of benzene from acetylene.

The theoretical yield of benzene can be calculated using the stoichiometry of the reaction between acetylene and benzene.

The balanced chemical equation for the reaction is: 3C2H2 (acetylene) → C6H6 (benzene)

From the stoichiometry, we can determine the theoretical yield of benzene from the given amount of acetylene.

Calculation:

1. Calculate the moles of acetylene (C2H2): - Using the ideal gas law: PV = nRT, where P = pressure, V = volume, n = moles, R = gas constant, T = temperature. - Given: Initial amount of acetylene = 120 L - Using the molar volume of a gas at STP (standard temperature and pressure) = 22.4 L/mol, we can calculate the moles of acetylene.

   n(C2H2) = V(C2H2) / VM = 120 L / 22.4 L/mol ≈ 5.35 mol
   

2. Calculate the moles of benzene (C6H6) produced: - From the balanced chemical equation, 3 moles of acetylene produce 1 mole of benzene. - Therefore, the moles of benzene produced is one-third of the moles of acetylene.

   n(C6H6) = 1/3 * n(C2H2) = 1/3 * 5.35 mol ≈ 1.785 mol
   

3. Calculate the theoretical yield of benzene: - Using the molar mass of benzene (C6H6) = 78 g/mol, we can calculate the theoretical yield of benzene.

   m(C6H6) = n(C6H6) * M(C6H6) = 1.785 mol * 78 g/mol ≈ 139.23 g
   

4. Calculate the percentage yield: - Using the formula: Percentage Yield = (Actual Yield / Theoretical Yield) * 100%

   Percentage Yield = (60 g / 139.23 g) * 100% ≈ 43%
   

Conclusion:

The percentage yield of benzene from the given amount of acetylene is approximately 43%. This means that 43% of the theoretically possible yield of benzene was obtained from the reaction.

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