Which groups among main group elements in the figure below have an odd number of

Question

Which groups among main group elements in the figure below have an odd number of valence Please select all that apply. group 1 (red) group 2 (yellow) group 13 (dark green) group 14 (dark blue) group 15 (purple) group 16 (light green) group 17 (light blue) group 18 (salmon) Carbon Nitrogen Oxygen Silicon Phosphorus Sulfur Which species has the longest carbon-oxygen bond length? Which has the shortest? Longest C-0 Bond CO CO2 O CO3^2-32- Shortest C-0 Bond CO CO2 C03^2- Rank the following molecules or ions in order of increasing carbon-oxygen bond energy: A. CO B. CO2 C. CO3^2- A

Explanation / Answer

Longest C-O bind CO3 2- because of containing one single C-O bond although it is wrong to say that because the two str. are in resonance

Shortest C-O bond is of CO

C<B<A

CH4 + 2 O2 --> CO2 + 2 H2O + heat

CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g) (balanced equation for methane combustion)

delta H= delta H(formation) (products) - delta H(formation) (reactants)= (-393,0 kJ mole^-1) + (2*(-240,7 kJ mole^-1)) - (-74,3 kJ mole^-1)= -800,1 kJ mole^-1

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