Consider the following molecules with trigonal planar geometry. Carbonate (CO32− C
O
3
2
−
) and nitrate (NO3−
N
O
3
−
) both exhibit resonance, whereas phosgene (COCl2
C
O
C
l
2
) does not. Given the information in the transition, and ignoring the simulation, predict the bond angles for each of the molecules in accordance to whether or not they exhibit resonance.
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111.4∘
∘
111.4 Superscript circ
120.0∘
∘
120.0 Superscript circ
124.3∘
∘
124.3 Superscript circ

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Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.

Given data,temperature, t = 230°c = 503 kconsider the chemical reaction,ch₃oh(l) + 1/2 o₂(g)  → ch₂o(g) + h₂o(l)calculate the enthalpy change for the reaction: δh⁰rxn =  σnδh⁰f(products) -  σmδh⁰f(reactants)substitute the values from the table: δh⁰rxn = { -115.9 + (-285.8)} - {0+(-238.7)}              = -163.0 kjcalculate the entropy change for the reaction.δs⁰rxn = (219 + 70) - (127.2 + 1/2 x 205.2) = 59.2 j/kconsider the expression for free energy: δg⁰rxn =  δh⁰rxn - t  δs⁰rxnsubstitute the values in the above equationδg⁰rxn = -163 x 10³ - (503 x 59.2)              = -192777.6 j              = -192.777 kj