Question

3. For the reaction 103 (aq) + 51(aq) + 6H*(aq) → 312(aq) + 3H2O(1) the rate of disappearance of I (aq) at a particular time and concentration is 2.6 x 10-' mol/(L · s). What is the rate of appearance of 12(aq)? A) 4.3 10-' mol/(L •s) B) 7.8 x 10-3 mol/(L • s) C) -1.6 x 10 mol/(L • s) D) 1.6 x 10' mol/(L •s) E) 6.4 x 10^'mol/(L •s) 4. For the first-order reaction 1/2 N2O4(g) → NO2(g); AH = 28 kJ/mol the activation energy is 53 kJ/mol. What is the activation energy for the reverse reaction? A) -25 kJ/mol B) 81 kJ/mol C) -53 kJ/mol D) 25 kJ/mol E) 53 kJ/mol

Answer 1

IO (aa) + SI @qj tot 312 ha) + 3H005 Rate of Reaction rate of disappearancest af Rate of appanna Rate of Reaction - - - d [F]) = 1/3 ( d (12) - (2.6 x 103 mohis) = 12 Rate of appearance of fz| of Iz Rate at appearance of Iz = 3 x 2.6x103 moh. = 1.6810-3 molks 4. V N₂O4 (9) NO₂ (9) AH =28kJ/mol Elzwast </Activation energy of backward reaction Product AH=28kJ/mol ReactanŤ - - - Progress of Reaction Activation energy of backward Reaction - Activation energy of forward Rku - AH - 53 kJ/mol - 28 kJ/mol = 25 kJ/mol