10. The reaction 2 A + B 2 C is found to be first-order in A and zeroth order in

Question

10. The reaction 2 A + B 2 C is found to be first-order in A and zeroth order in B and has a half time of 1.0 min at some temperature. If [C]. 0 and [AJ.- (B]. -2.0 M, plot the time course of the reaction for a few minutes showing [A], [B], and (C]. 125 .5 11. Concentrated sodium hydroxide is 19.4 M and has a density of 1.54g/mL. What is the molality of concentrated NaOH? dersity-1.54 /mL m moles of solut e R of alven mal of Solute LItEr3 of So a) 17.8 m b) 32.7 m c) 25.4 d) 56.9 m e) None of the above .4M 12. To prepare 1.000 kg of 55% by mass (w/w) KCl(aq), one may dissolve: a) 994.5 g KCl in 5.5 g of water b) 5.5 g KCl in 994.5 g of water c) 5.5 g KCl in 1000.0 g of water d) 55 g KCl in 945 g of water e) 55.0 g KCl in 1000.0 g of water 13. What is the overall order of the reaction below, 163

Explanation / Answer

Molality =(1000 *molarity) /(1000*density - molarity *molar mass of NaOH)

Molality = (1000* 19.4)/(1000* 1.54 - 19.4 *40)

= (19400) /(1540 - 776)

= (19400)/(764)

= 25.39

Answer is 25.4

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