Chemistry

posted by .

I am to use this formula to find ΔH°f,methane:
ΔH°comb=2ΔH°f,water+ΔH°f, carbon dioxide-ΔH°f,methane-2ΔH°f,oxygen

For ΔH°comb, the value is 884 KJ/mol
For ΔH°f,water, the value is -285.8
For ΔH°f,carbon dioxide, the value is -393.5

I was not given ΔH°f,oxygen, what value would it be?

  • Chemistry -

    The pure element is zero. All elements in their standard state are zero.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    How do i calculate: What is is ΔG° at 25 °C?
  2. chemistry

    # Which of the following is true for the reaction NH3(l) NH3(g) at –33°C and 1 atm pressure?
  3. chemistry

    Suppose the ΔGof, ΔHof, and ΔSo are available and valid at 298 K. Which equation(s) could be used to calculate the change in Gibbs Energy if all product and reactant concentrations (pressures) are 1 M (1 atm) and the …
  4. chemistry

    1.) For which of the following substances is the standard enthalpy of formation equal to zero?
  5. Chemistry

    HClO(aq) + H2O (l) <> H3O+ (aq) + ClO-(aq) Calculate the value of ΔGrxn at 25 °C for hypochlorous acid when [ClO-]=[H3O+]=5.69x10^-5 M [HClO] = 1.340 M Previously calculated a ΔGºrxn of 42.20 kJ/mol Q = [5.69x10^-5] …
  6. Chemistry

    How would you exactly start the first problem?
  7. Chemistry

    A system which undergoes an adiabatic change (i.e., q = 0) and has work done on it by the surroundings has a. w < 0, ΔU = 0 b. w < 0, ΔU < 0 c. w > 0, ΔU < 0 d. w > 0, ΔU > 0 e. w < 0, ΔU …
  8. Math

    Sorry! I don't get this one either.. limit of (f(x+Δx)-f(x)) / Δ x with Δ x -> 0 f(x)= 1/(x+3) My work so far before I got stuck... 1/((x+Δx)+3) = 1/(x+Δx+3) - 1/x+3 = 1(x+3)/(x+Δx+3)(x+3) - 1(x+Δx+3)/(x+3)(x+Δx+3) …
  9. Math

    Suppose f (0) = 9, f ′(0) = 2, and f ″(0) = -4. If df is used to approximate Δf when Δx = 0.01, which of the following would be true?
  10. Chemistry

    Calcium chloride, CaCl2, is used in “hot packs”. When the solid is mixed with water, the products are favored. Based on this information, which of the following is true for the values of ΔH and ΔS for the dissolving process?

More Similar Questions