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When 0.250 mol of CH4(g) reacts with excess Cl2(g) at constant pressure according to the chemical equation shown below, 177 kJ of heat are released. Calculate the value of Delta H for this reaction, as written.


delta H=?

  • Chemistry -

    If 1/4 mole releases 177 kJ, then 1 mole will release 4x that and 2 moles will release 8x that. Check my thinking.

  • Chemistry -


  • Chemistry -

    I get 1416 kJ. If you rounded your answer because of significant figures, showing it as 1420 won't do it. Most texts recommend writing it as 1.42 x 10^3 kJ.

  • Chemistry -

    hhmm would it be 4x that amount and not 8? im confused

  • Chemistry -

    moles = grams/molar mass
    0.25 = g/16 and grams = 0.25 x 16 = 4 grams.
    The equation as written is 2 moles CH4 so that is 16 x 2 = 32 grams.
    177 kJ (for the reaction for the 4 grams) x (32/4) = ??

  • Chemistry -

    i guess the teacher put a bad answer bank none of the answer are 1416 but i get what you are saying i will bring this up to him thanx

  • Chemistry -

    Try 1.42 x 10^3 kJ and let me know.

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