Using the following Table, estimate H for the followinggas-phase reaction. 2NCl

Question

Using the following Table, estimate H for the followinggas-phase reaction.

2NCl3(g)-->N2(g)+3Cl2(g)

Properties of the Alkali Metals




Element Electron Configuration Atomic Radius (pm) IE1(kJ/mol) Density at 25°C(g/cm3) Melting Point (°C) Li [He]2s1 152 520 0.54 181 Na [Ne]3s1 186 496 0.97 102 K [Ar]4s1 227 419 0.86 98 Rb [Kr]5s1 248 403 1.53 39 Cs [Xe]6s1 265 376 1.88 29
Properties of the Alkali Metals




Element Electron Configuration Atomic Radius (pm) IE1(kJ/mol) Density at 25°C(g/cm3) Melting Point (°C) Li [He]2s1 152 520 0.54 181 Na [Ne]3s1 186 496 0.97 102 K [Ar]4s1 227 419 0.86 98 Rb [Kr]5s1 248 403 1.53 39 Cs [Xe]6s1 265 376 1.88 29

Explanation / Answer

We Know that :        The given reaction is:           2NCl3(g)-->N2(g)+3Cl2(g)         H = bonds broken - bonds formed                = 2 [ 3 x N-Cl ] - [ N (tripple bond) N + 3( Cl-Cl ) ]                 = 6 x 313 kJ - [ 942 + 3 x 240 ] kJ                  = 216 kJ

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