Conjugate Pairs Conjugate Pairs According to the Br A lot of food exists in the

Question

Conjugate Pairs

Conjugate Pairs

According to the Br A lot of food exists in the form of solid when initially taken up by us. After they enter the body, they will be digested into small molecules. For instance, rice is mainly composed of solid state polysaccharides that will be decomposed into glucose. Our body is able to metabolize glucose with the aid of oxygen via the mechanism of aerobic respiration to form carbon dioxide and water. During the oxidation, energy will be released to support the behavior of cells, tissues, and organs. [at a standard condition with 1 bar and 298.15 k, the standard enthalpies of formation of glucose, carbon dioxide, and water are -1274, -394, and -286 KJ/mol, respectively. The entropy of glucose at the standard condition is 209.2 J/mol. The molar heat capacity of glucose is 115 J/ K. mol] If we need 200 g glucose each day to support our activities, what is the amount of energy released from glucose oxidation? What is the theoretical maximum amount of non-expansion work can we get from glucose oxidation? Please also find standard enthalpy of reaction and the change of internal energy for comparison. Conjugate Pairs According to the Bronzed-Lowry theory, an acid is any substance (molecule or ion) that can transfer a proton (H+ ion) to another substance, and a base is any substance that can accept a proton. Acid-base reactions are proton-transfer reactions, as follows: HA + B ? BH+ + A? acid base acid base Chemical species whose formulas differ only by one proton are said to be conjugate acid-base pairs. Thus, A? is the conjugate base of the acid HA, and HA is the conjugate acid of the base A?. Similarly, B is the conjugate base of the acid BH+, and BH+ is the conjugate acid of the base B. Strong acids have very weak conjugate bases, and very weak acids have strong conjugate bases. Part A The following equation shows the equilibrium in an aqueous solution of methylamine: CH3NH2(aq)+H2O(1)?CH3NH3+(aq)+OH?(aq) Which of the following represents a conjugate acid-base pair? CH3NH2 and H2O CH3NH3+ and OH? H2O and OH? CH3NH2 and OH? Correct In the presence of methylamine (a weak base), H2O acts as an acid and donates a proton. OH? is a conjugate base of H2O. Part B What is the conjugate base of HSO3?? Express your answer as a chemical formula. Part C What is the conjugate acid of HPO42? ? Express your answer as a chemical formula. Part D Among three bases, X?, Y?, and Z?, the strongest one is Y?, and the weakest one is Z?. Rank their conjugate acids, HX, HY, and HZ, in order of decreasing strength. Rank the acids from strongest to weakest. To rank items as equivalent, overlap them.

Explanation / Answer

PartA

H2O and OH?

PartB
SO3^-2

PartC
H2PO4^-

PartD
HZ > HX >HY

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