74. Using the table of bond enthalpies in your textbook, what is the change in e

Question

74. Using the table of bond enthalpies in your textbook, what is the change in enthalpy (in kJ) when 1.1 mol of carbon dioxide molecules are broken into atoms?

76. How many lone pairs of electrons are on the central atom in xenon tetrafluoride?

77. How many resonance structures does the carbonate ion have?

78. What is the formal charge on carbon in the carbonate ion?

82. A period three element has 738, 1451, and 7733 kJ/mol as its first three ionization energies. What is the symbol of this element?

P.s I'm really greatful! Thanks!

Explanation / Answer

Ans 74 : Bond dissociation energy is the amount of energy required to break one mole of bonds of a compound.

The CO2 molecule has two C=O bonds.

The bond energy of one C=O is 799 KJ/mol

So for two bonds in one mole molecule will be 799 x 2 = 1598 KJ / mol

So the change in enthalpy of 1.1 mol CO2 will be 1.1 x 1598

= 1757.8 KJ

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