Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Trending News

Promoted
hlh6591
hlh6591 asked in Science & MathematicsChemistry · 1 decade ago

activation energy question?

A rule of thumb in chemical kinetics states that for many reactions, the rate of reaction approximately doubles for a temperature rise of 10°C. What must be the activation energy of a reaction if the rate is indeed found to double between 25°C and 35°C?

1 Answer

Relevance
  • Anonymous
    1 decade ago
    Favorite Answer

    The Arrhenius equation is

    k = A exp( -Ea / RT )

    so

    k1 = A exp( -Ea / R(298K) )

    k2 = A exp( -Ea / R(308K) )

    k2 / k1 = 2

    = exp( -Ea / R(308K) ) / A exp( -Ea / R(298K) )

    = exp( -Ea / R(308K) - -Ea / R(298K) )

    ln 2 = Ea/R ( 1/298K - 1/308K )

    or about 100 kJ/mol

    m

Still have questions? Get your answers by asking now.