PS2 - 1 Recommended Reading: 5.1 5.5 (no character tables),...

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Unformatted text preview: 1 Recommended Reading: 5.1 5.5 (no character tables), 16 Ch 102 Problem Set 2 Due: Tuesday, April 13 Before Class Problem 1 (30 points) A) On-board storage of hydrogen is a major obstacle for the use of hydrogen as a clean-burning transportation fuel. Ammonia-borane is an appealing candidate for chemical hydrogen-storage applications. Amine-borane adducts can be readily synthesized from free amines and boranes. Thermal decomposition of ammonia-borane adducts yields hydrogen and a mixture of aminoborane and borazine products. Give the point group for ALL of the reactants and products shown below except polyborazylene (dont forget H 2 !). B H BH 3 + B N H H H H H H N B H H H H N B N B N H H H H H H H H H H H NH 3- H 2 + HN HB N H BH NH H B borane ammonia ammonia-borane aminoborane borazine cyclotriborazane cyclodiborazane- H 2 NH B NH HB HN HB NH B NH HB N HB diborazine (NOTE: assign point groups for two conformers; one in which the rings are coplanar and one in which the rings are perpendicular) HN HB N H B N H B NH B NH HB HN HB NH B NH HB N HB N H BH NH H B NH BH NH HB N HB NH B NH HB N HB + + x borazanaphthalene p-borazaterphenyl polyborazylene B H H H H H H H N B N H (consider only the conformer with coplanar rings)- H 2- H 2 2 B) Using the equation below calculate the hydrogen capacity (wt%) of ammonia-borane. Be sure B) Using the equation below calculate the hydrogen capacity (wt%) of ammonia-borane....
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PS2 - 1 Recommended Reading: 5.1 5.5 (no character tables),...

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