Ethane, a minority component of natural gas, burns to form carbon dioxide and water according to this reaction: 2h3c−ch3(g)+7o2(g)→4co2(g)+6h2o(g) note that the average bond energy for the breaking of a bond in co2 is 799 kj/mol. use average bond energies to calculate δhrxn for this reaction.

The answer is -2812 kJ.

Explanation:

I got this answer from another person:

The following values will vary depending on the source;

C-C  347 kJ/mole;  C-H 414 kJ/mole;  O-H 464 kJ/mole ;  O=O  498 kJ/mole

It takes energy to break bonds and energy is released when bonds are formed.

Ethane has 1 C-C bond  ;  1(347 )  347 kJ/mole

Ethane has 6-C-H bonds;  6(414) = 2484 kJ/mole

Break the bonds of 1 mole of C2H6  =  2831 kJ

2 moles of ethane in balanced equation:  2(2831 kJ) =  5662 kJ

Break 7 O=O bonds  =  7(498 ) = 3486

Total energy to break all bonds: 5662 +   2486 = +9148 kJ

2C=O bond formed in CO2  = 2(799) =  1598 kJ/mole

4 moles of CO2 = 4(1598) =  6392

2(O-H) bonds in H2O =  2(464)  =  928 kJ/mole

6 moles of H2O  =  6(928 kJ) = 5568

Total energy released =  6392 + 5568 = 11,960 kJ  

The sign of this energy is -11,960 since it is exothermic.

Energy change for 2 moles of ethane = -11,960 + 9148 = -2812 kJ

ΔHrxn = -2812 kJ

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.