Ask Question
22 May, 18:31

The hydrolysis of sucrose (C12H22O11) into glucose and fructose in acidic water has a rate constant of 1.8*10-4s-1 at 25 ∘C. Assuming the reaction is first order in sucrose, determine the mass of sucrose that is hydrolyzed when 2.55 L of a 0.160 M sucrose solution is allowed to react for 200 minutes.

+3
Answers (1)
  1. 22 May, 18:34
    0
    Mass of sucrose that is hydrolyzed = 123.55 g

    Explanation:

    Since the reaction is a first ofree reaction,

    Let the initial concentration of sucrose be C₀

    And the concentration of sucrose left at any time be C.

    r = (dC/dt) = - kC (Minus sign because it's a rate of reduction)

    K = rate constant

    (dC/dt) = - kC

    (dC/C) = - kdt

    ∫ (dC/C) = - k ∫ dt

    Solving the two sides as definite integrals by integrating the left hand side from C₀ to C and the Right hand side from 0 to t.

    We obtain

    In (C/C₀) = - kt

    (C/C₀) = (e⁻ᵏᵗ)

    C = C₀ e⁻ᵏᵗ

    So, we can find the concentration of sucrose left at the given time

    k = 1.8 * 10⁻⁴ s⁻¹

    t = 200 minutes = 200 * 60 = 12000 s

    kt = 12000 * 1.8 * 10⁻⁴ = 2.16

    C₀ = 0.160 M

    C = 0.160 e⁻²•¹⁶ = 0.01845 M

    So, the concentration that has been used up = 0.160 - 0.01845 = 0.142 M

    To calculate the mass of sucrose that has reacted, we'll convert the concentration used up into number of moles.

    Concentration = (number of moles) / (volume in Litres)

    number of moles = concentration * volume in Litres

    Volume in Litres = 2.55L

    Number of moles = 0.142 * 2.55 = 0.361 moles

    Then, mass = number of moles * Molar mass

    Molar mass of sucrose = 342.3 g/mol

    Mass of sucrose used up = 0.361 * 342.3 = 123.55 g
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “The hydrolysis of sucrose (C12H22O11) into glucose and fructose in acidic water has a rate constant of 1.8*10-4s-1 at 25 ∘C. Assuming the ...” in 📗 Chemistry if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers