When One Mole of Gaseous Hydrogen Peroxide,H₂O₂,is Made from Hydrogen

question 19

Multiple Choice

When one mole of gaseous hydrogen peroxide,H₂O₂,is made from hydrogen and oxygen gases,the enthalpy change is -136 kJ.Which of the following correctly represents the thermochemical equation?
i.H₂(g) + O₂(g) → H₂O₂(g) + 136 kJ
ii.H₂(g) + O₂(g) + 136 kJ → H₂O₂(g)
iii.H₂(g) + O₂(g) → H₂O₂(g) ΔH = -136 kJ
iv.H₂(g) + O₂(g) → H₂O₂(g) ΔH = +136 kJ

• A)i only
• B)ii only
• C)iii only
• D)i and iii
• E)ii and iv

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