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Nine. fifty eight. +43 kJ Estimate the bond power of the F-F following bond energies in kJ/mol: bond provided that A@ of HF(g) is -271 kJ/mol, and given the H-F 565 Ans. 153kJ/mol H-H 435 156 CHEMICAL BONDING AND MOLECULAR constitution [CHAP. nine SHAPES OF MOLECULES nine. fifty nine. The platinum-chlorine distance has been chanced on to be 232pm in numerous crystalline compounds. If this price applies to either one of the compounds proven in Fig. 9-18, what's the chlorine-chlorine distance in (a) constitution (a), (b) constitution (b)? Ans. nine. 60. what's the size of a polymer molecule containing 1001 carbon atoms singly bonded in a line, if the molecule might be stretched to its greatest size in keeping with upkeep of the traditional tetrahedral perspective inside of any C-C-C staff? Ans. nine. sixty one. 126nm A plant virus used to be tested by means of the electron microscope and was once discovered to encompass uniform cylindrical debris 15. 0nm in diameter and 300nm lengthy. The virus has a particular quantity of zero. 73cm3/g. If the virus particle is taken into account to be one molecule, what's its molar mass? A nine. sixty two. (a) 464pm, (6) 328pm ~ four. four ~ . 10' Assuming the additivity of covalent radii within the C -C1 bond, what often is the chlorine-chlorine distance in all the 3 dichlorobenzenes (Fig. 9-49)? suppose that the hoop is a customary hexagon and that every C-Cl bond lies on a line throughout the middle of the hexagon. the space among adjoining carbons is 140pm. qcl gycl c1 c1 (b) Fig. 9-49 Ans. (a) 316pm; (b) 547pm; (c) 632pm nine. sixty three. Estimate the size and width of the carbon skeleton in anthracene [see challenge 9-43(a) for a diagram]. imagine hexagonal jewelry with equivalent carbon-carbon distances of 140pm. Ans. 730pm lengthy, 280pm vast nine. sixty four. BBr3 is a symmetrical planar molecule, all B- Br bonds mendacity at a hundred and twenty" to one another. the gap among Br atoms is located to be 324 pm. From this truth and on condition that the covalent radius of Br is 114pm, estimate the covalent radius of boron, assuming that the bonds are all unmarried bonds. Ans. 73pm nine. sixty five. what's the VSEPR quantity for the critical atom in all the following species? (Hint: Draw the Lewis constructions first. ) (a) SO^, (b) SO^, ( c ) SO:-, ( d ) SO:-, ( e ) S F ~ , (f)s:-. Ans. (a) three; (b) three; (c) four; ( d ) four; (e) 6; nine. sixty six (f)4 What are the bond angles in all the species within the previous challenge? Ans. (a) a little bit under 120"; (b) 120"; (c) a little lower than (f)slightly lower than 109'28' nine. sixty seven. 109"28'; (d) 109'28' ( e ) 90"; for every of the subsequent species provide the VSEPR quantity, the overall form, and the bond angles. (a) XeF4, (b) Xe03, (c) XeF2. CHAP. ninety one CHEMICAL BONDING AND MOLECULAR constitution 157 Ans. (a) VSEPR quantity 6, sq. planar, 90'; (b) VSEPR quantity four, trigonal pyramid with unshared pair at apex, just a little below 109'28'; (c) VSEPR quantity five , linear, one hundred eighty" nine. sixty eight. Which of the next molecules or ions is/are directly (i. e. , all bond angles are 180°)? (a) OF2, (b) HCN, (c) H2S, (4CO2, ( e ) IF;. AnS. (b), nine. sixty nine. Which of the subsequent molecules or ions is/are bent? (a) BeC12, (b) HOC1, (c) sizzling, ( d ) NHT, (e) NT.

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