Ask questions and get helpful responses.

Biology 12

The question is asking to calculate the overall energy change in the combustion of ethane (C2H6). This is what I have done:

The balanced equation:
C2H6 + 6 O2 --> 2 CO2 + 3 H2O

(6) 411 + 346 + (6) 494 --> (2) 799 + (3) 459
2466 + 346 + 2964 --> 1598 + 1377
= 5776 = 2975

5776 - 2975 = 2801

2801 kJ/mol of ethane / 30.08 g/mol = 93.11

The answer in the text book says 47 kJ/g.

What am I doing wrong?

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
  1. you didn't balance the equation properly
    it's supposed to be
    2C2H6 + 702 -> 4CO2 + 6H2O

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩

Respond to this Question

First Name

Your Response

Still need help? You can ask a new question.