I can\'t figure out part 4 or 5 Sta xQ What is the name of the co > O Ga l https

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I can't figure out part 4 or 5

Sta xQ What is the name of the co > O Ga l https:/ 16230 4HW 19.27 out of 20 12/13/17 17 Question (1 point) a See page 165 One proposed source of clean energy is the combustion of hydrogen in the presence of oxygen. This reaction releases a significant amount of energy and the only product of the reaction is water. The balanced chemical equation is shown here: 2H2(g)-02(g)- 2H2O(g) + energy So where does the energy come from? 7th attempt Part 1 (0.2 point) hi See Periodic Table See Hint Chemical bonds hold atoms together in molecules. To break apart the atoms in a molecule requires energy sufficient to overcome the attractive force holding the atoms together. Based on this statement, when we break a chemical bond, is energy absorbed by the chemical bond or is energy released from the chemical bond? Energyis "I Part 2 (0.2 point) 0 See Hint In a hydrogen molecule, the two hydrogen atoms are held together by a single bond with a bond energy of 436 kJ/mol of hydrogen. In other words, to break the H-H bonds in one mole of molecular hydrogen requires the expenditure of 436 kJ of energy. Using the balanced chemical equation for the formation of water from oxygen and hydrogen (shown above), and interpreting the stoichiometric 19 OF 20QUESTIONS COMPLETED 17,20 > VIEW SOLUTION SUBMIT ANSWE 0 ALIENWARE

Explanation / Answer

Part 4)

energy released in forming O-H bonds = 463 kJ/mol

Part 5)

Overall enthalpy change for the reaction,

dHrxn = dH(reactants) - dH(products)

taking data for each bond,

dHrxn = (2 x 436 + 495) - (2 x 2 x 463)

           = -485 kJ/mol

So in forming 2 moles of H2O starting with 2 moles of H2 and 1 moles of O2 we are releasing -485 kJ/mol of energy.

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