NEED HELP ON PART B AND D Write a balanced chemical equation depicting the forma

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NEED HELP ON PART B AND D
Write a balanced chemical equation depicting the formation of one mole of H2O2(g) from its elements in their standard states. Express your answer as a chemical equation. Identify all of the phases in your answer. H2(g)+O2(g)?H2O2(g) Part B For H2O2(g), find the value of ?H?f. (Use Appendix C) Express your answer using five significant figures.

Part C Write a balanced chemical equation depicting the formation of one mole of CaCO3(s) from its elements in their standard states. Express your answer as a chemical equation. Identify all of the phases in your answer. Ca(s)+C(s)+32O2(g)?CaCO3(s) Part D For CaCO3(s), find the value of ?H?f. (Use Appendix C) Express your answer using five significant figures.
NEED HELP ON PART B AND D
Write a balanced chemical equation depicting the formation of one mole of H2O2(g) from its elements in their standard states. Express your answer as a chemical equation. Identify all of the phases in your answer. H2(g)+O2(g)?H2O2(g) H2(g)+O2(g)?H2O2(g) H2(g)+O2(g)?H2O2(g) H2(g)+O2(g)?H2O2(g) Part B For H2O2(g), find the value of ?H?f. (Use Appendix C) Express your answer using five significant figures.

Part C Write a balanced chemical equation depicting the formation of one mole of CaCO3(s) from its elements in their standard states. Express your answer as a chemical equation. Identify all of the phases in your answer. Ca(s)+C(s)+32O2(g)?CaCO3(s) Part D For CaCO3(s), find the value of ?H?f. (Use Appendix C) Express your answer using five significant figures.
Part C Write a balanced chemical equation depicting the formation of one mole of CaCO3(s) from its elements in their standard states. Express your answer as a chemical equation. Identify all of the phases in your answer. Ca(s)+C(s)+32O2(g)?CaCO3(s) Part C Write a balanced chemical equation depicting the formation of one mole of CaCO3(s) from its elements in their standard states. Express your answer as a chemical equation. Identify all of the phases in your answer. Ca(s)+C(s)+32O2(g)?CaCO3(s) Ca(s)+C(s)+32O2(g)?CaCO3(s) Ca(s)+C(s)+32O2(g)?CaCO3(s) Ca(s)+C(s)+32O2(g)?CaCO3(s) Part D For CaCO3(s), find the value of ?H?f. (Use Appendix C) Express your answer using five significant figures. H2(g)+O2(g)?H2O2(g)

Explanation / Answer

H2(g) + O2(g) --> H2O2(g)
Heat of formation is -136.1 kJ/mol (I looked it up)

H2(g) + 1/2 O2(g) --> H2O(g)
Heat of formation is -241.8 kJ/mol (I looked it up)

Take the first equation and reverse it. It will change the sign of delta H.
Then double this equation. It will double the value of delta H.

2 H2O2(g) --> 2 H2(g) + 2 O2(g)
Heat of formation is +272.2 kJ/mol

Now take the second equation and double it. It will double the value of delta H.

2 H2(g) + O2(g) --> 2 H2O(g)
Heat of formation is -483.6 kJ/mol

Now add the two reactions together, and you will cancel out one mole of O2 and 2 moles of H2. Your reaction will now look more like the one you want. You add the two values of delta H together to get the delta H of the overall reaction. (+272.2) + (-483.6) = -211.4 kJ

The enthalpy for the decomposition of ONE MOLE would be half this value, or -105.7 kJ

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