chem 211

posted by .

Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 144 kJ is given off per mole of C2H4 reacting, how much heat is released when 14.6 kg of C2H6 forms?

  • chem 211 -

    Write the balanced chemical reaction:
    C2H4 + H2 -> C2H6 , ΔH = -144 kJ/mol C2H4

    Then we get the number of moles of C2H4 using the given mass, 14.6 kg of C2H6.
    Molar mass, C2H6 = 2*12 + 6*1 = 30 g/mol
    n,C2H6 = 14.6 * 1000 g / 30 g/mol = 486.67 mol
    Since the mole ratio for C2H4 and C2H6 is 1:1,
    n,C2H4 = 486.67 mol
    Finally, we multiply the energy by this number of moles:
    -144 kJ/mol C2H4 * 486.67 mol C2H4
    = -70,080 kJ

    Note that the negative sign just indicates that the heat is released.

    Hope this helps~ :)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. CHEM organic chem

    i am really confused! i am doing the production of ethene from fractional distillation and i understand the whole concept of it what i don't get is how i can write a balanced eqn to show how ethene can be produced from C14H30 (tetradecane?
  2. science/ chemistry

    Over 80 000 vehicles per day pass the site and the traffic is frequently congested. The surrounding area is described as forming a street canyon. The temperature at the site had reached 25 °C by 08:00, when the ethane concentration …
  3. Chemistry

    Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 124 kJ is given off per …
  4. College Chemistry

    1. What is the change in internal energy (in J) of a system that absorbs 0.677 kJ of heat from its surroundings and has 0.438 kcal of work done on it?
  5. Chemistry

    Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 124 kJ is given off per …
  6. chemistry

    explain what is meant by the term 'Hybridisation' in molecular orbital theory and show how the concept can be used to explain the structure and bonding in ethane C2H6 ETHENE C2H4 AND ETHYNE C2H2
  7. Chemistry

    What are the enthalpy, entropy, and free energy for the hydrogenation of ethene (C2H4) to ethane (C2H6) at 25 degrees. Is this a spontaneous process and how can you tell?
  8. chemistry

    Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 132 kJ is given off per …
  9. Chem

    Consider the following equation in chemical equilibrium C2H4(g) <--> C2H6(g) + 137 kJ What happens to the ethane (C2H6) when the temperature of the system is increased
  10. Chemistry

    In the dehydrogenation of ethane two reactions take place: C2H6 => C2H4 + H2 C2H6 + H2 => 2CH4 The mass distribution of the product is: 27% C2H6; 33% C2H4; 13% H2; 27% CH4. 1. What was the conversion of C2H6 to CH4?

More Similar Questions