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Identify the equation in which change in enthalpy is equal to change in internal energyA. `2H_(2) O_(2)(l) to 2H_(2)O(l) + O_(2)(g)`B. `C(s) + O_(2) (g) to CO_(2) (g)`C. `PCl_(5)(g) to PCl_(3)(g) + Cl_(2)(g)`D. `N_(2)(g) +3H_(2)(g) to 2NH_(3)(g)` |
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Answer» Correct Answer - B `Delta H = Delta U + Delta n_(g) RT` In the given options (a) `2H_(2) O_(2) (l) to 2H_(2) O (l) + O_(2) (g) Delta n_(g) = 1` `:. Delta H = Delta U + RT` (b) `C (s) + O_(2) (g) to CO_(2) (g)` `Delta n_(g) - 1 - 1 = 0` `:. Delta H = Delta U` (c ) `PCI_(5) (g) to PCI_(3)(g) + CI_(2)(g)` `Delta n_(g) = 2 - 1 = 1` `:. Delta H = Delta U + RT` (d) `N_(2) (g) + 3H_(2) (g) to 2NH_(3) (g)` `Delta n_(g) RT = 2 - 3 = - 1` `:. Delta H = Delta U - RT` Equation given in option (b) has enthalpy change equal to internal change. |
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