What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients?

(The equation is listed in the picture below)

Attachment image

3 Answers

Relevance
  • 1 month ago

    Let a, b, c and d be the coefficients for each of the reactants and products, listed in order.

    Balancing each element gives:

    Carbon: 2a = 1c

    Hydrogen: 6a = 2d

    Oxygen: 1a + 2b = 2c + 1d

    Let's set a = 2 and see what happens.

    Then c = 4, d = 6 and b = 6.

    That leaves the equation as: 2C2H5OH + 6O2 => 4CO2 + 6H2O

    Dividing through by 2 gives the balanced equation as

    C2H5OH + 3O2 => 2CO2 + 3H2O

    This balances on all elements.

    The coefficient of the O2 term is 3.

    • Login to reply the answers
  • 1 month ago

    Combustion reaction ....

    "The complete combustion of a hydrocarbon produces carbon dioxide gas and water vapor."

    C2H5OH(g) + 3O2(g) --> 2CO2(g) + 3H2O(g)

    • Login to reply the answers
  • Dr W
    Lv 7
    1 month ago

    start with

    .. __ C2H3OH + __ O2 ----> __ CO2 + __ H2O

    choose a starting element and an integer to start with.

    I choose "C" and the number "2"

    .. 2 C2H3OH + __ O2 ----> __ CO2 + __ H2O

    balance C's

    .. 2 C2H3OH + __ O2 ----> 4 CO2 + __ H2O

    balance H's

    .. 2 C2H3OH + __ O2 ----> 4 CO2 + 4 H2O

    balance O's

    .. 2 C2H3OH + __ O2 ----> 4 CO2 +4 H2O

    you have 4*2 + 4*1 = 12 O's on the right

    you already have 2*1 = 2 O's on the left

    so you need 12 - 2 = __ O's more on the left

    so how many O2's is that?

    • Login to reply the answers
Still have questions? Get your answers by asking now.