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State whether each of the following proc...

State whether each of the following processes is exothermic or endothermic : `H_2O (l) to H_2O (g) , DeltaH = + 40 .7 kJ `.

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To determine whether the process of converting liquid water (H₂O) to gaseous water (H₂O) is exothermic or endothermic, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Process**: The process given is the conversion of liquid water (H₂O (l)) to gaseous water (H₂O (g)). 2. **Analyze the Given Data**: The change in enthalpy (ΔH) for this process is provided as +40.7 kJ. ...
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State whether the following processes is exothermic or endothermic : H_2O (l) to H_2O (s) , Delta H = - 6.01 kJ

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Knowledge Check

  • What will be the heat of reaction for the following reaction? Will the reaction be exothermic or endothermic? Fe_(2)O_(3(s))+3H_(2(g))rarr 2Fe_((s))+3H_(2)O_((l)) Delta_(f)H^(@)(H_(2)O,l)=-"285.83 kJ mol"^(-1) Delta_(f)H^(@)(Fe_(2)O_(3),s)=-"824.2 kJ mol"^(-1)

    A
    `-"824. 2 kJ mol"^(-1),` exothermic
    B
    `+"33.3 kJ mol"^(-1),` endothermic
    C
    `-"33.3 kJ mol"^(-1)`, exothermic
    D
    `+"824.2 kJ mol"^(-1),` endothermic

  • The formation of the oxide ion O^(2-) (g) requires first an exothermic and then an endothermic step as shown below : O (g) + e^(-)= O^(-) (g), DeltaH^(@) = - 142 kJ moI^(-1) O(g)+e^(-)toO^(2-)(g),DeltaH^(@)=844kJmol^(-1) This is because

    A
    oxygen is more electronegative
    B
    oxygen has high electron affinity
    C
    `O^(-)` ion will tend to resist the addition of another electron
    D
    `O^(-)` ion has comparatively larger size than oxygen atom.

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