α-maltose (C12H22O11) can be hydrolysed to glucose (C6H12O6) as: C12H22O11(aq) + H2O(l) → 2C6H12O6(aq). On the basis of following data, identify the correct statement(s) related with the reaction: ΔfH

Question

α-maltose (C12H22O11) can be hydrolysed to glucose (C6H12O6) as: C12H22O11(aq) + H2O(l) → 2C6H12O6(aq). On the basis of following data, identify the correct statement(s) related with the reaction: ΔfH°_C12H22O11 = -2238 kJ/mol, ΔfH°_C6H12O6 = -1263 kJ/mol, ΔfH°_H2O = -285 kJ/mol. Time (min): 0, 50, 100. Conc (M): 0.4, 0.1, 0.025.

Prashant Kotian · Accepted Answer

Correct answer: A,B,C,D. ΔH_rxn = 2(-1263) - (-2238 - 285) = -3 kJ/mol (Exothermic). Increasing temp decreases extent of exothermic reactions. Hess's law confirms combustion heat difference. Concentration data drops from 0.4 to 0.1 (1/4th) in 50 min, and 0.1 to 0.025 (1/4th) in another 50 min, showing a constant half-life of 25 min, indicating first-order kinetics. Therefore, correct answer is A,B,C,D.

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