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Enthalpy Change |
| Type of Reaction | Exothermic | Endothermic |
|---|---|---|
| Energy absorbed or released | Energy is released. Energy is a product of the reaction. Reaction vessel becomes warmer. Temperature inside reaction vessel increases. |
Energy is absorbed. Energy is a reactant of the reaction. Reaction vessel becomes cooler. Temperature inside reaction vessel decreases. |
| Relative Energy of reactants & products | Energy of the reactants is greater than the energy of the products | Energy of the reactants is less than the energy of the products |
| Sign of |
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| Writing the equation | N2(g) + 3H2(g) -----> 2NH3(g) + 92.4 kJ N2(g) + 3H2(g) ---> 2NH3(g)   |
2NH3(g) + 92.4 kJ -----> N2(g) + 3H2(g) 2NH3g ---> N2(g) + 3H2(g)   |
| Energy Profile | Energy of reactants (N2 & H2) is greater than the energy of the products (NH3).Energy is released. |
Energy of reactants (NH3) is less than the energy of the products (N2 & H2).Energy is absorbed. |
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