The total number of pi bonds in the structure is and total umber sigma bonds is.

Question

The total number of pi bonds in the structure is and total umber sigma bonds is. 4,20 4,21 4,19 4,18 none of the above Given the following data, determine the enthalpy of formation for sodium chloride Na(s) +1/2 C1_2(g)NaCL(s)Ionization energy of sodium => 496 kJ/mole Electron affinity for chlorine => -349 kJ/mole Bond Energy => 120 kJ for1/2 moleat of sublimation for sodium => 108 kJ/mole Lattice energy for NaCl => -786 kJ/mole. -786 kJ -291 kJ 375 kJ -4UkJ none of the above What is the bond angle in CO_2180degree 109.5 degree 90 degree 104 degree none of the above

Explanation / Answer

9)

The reaction goes as follows.

First Na(s) is converted to Na(g). Energy associated is the heat of sublimation of Na = 108 kJ / mol

Na(s) -----> Na (g) ............ H1 = 108 kJ / mol

and 1/2 Cl2 is converted to gaseous atomic Cl. The energy associated is bond energy of Cl2

1/2 Cl2 ----> Cl (g) ...........H2 = 120 kJ / mol

Second, we convert Na to Na+ and Cl to Cl-

In conversion of Na to Na+, energy associated is the ionization energy of sodium

Na -----> Na+ + e- ............... H3 = 496 kJ / mol

In conversion of Cl to Cl-, energy associated is electron affinity of chlorine

Cl + e- -----> Cl- ..............H4 = - 349 kJ / mol

Finally,

Na+ + Cl- -----> NaCl (s) ............ H5 = - 786 kJ / mol

Enthalpy of formation of NaCl = H1 + H2 + H3 + H4 + H5 = 108 + 120 + 496 + (-349) + (-786) = - 411 kJ / mol

d) - 411 kJ / mol

10) CO2 has a linear arrangement of atoms. Hence the bond angle is 180 degree

a) 1800

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