APPENDIX C Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) 1114 AG} (kJ/mol) S° AH (kJ/mol) (kJ/mol) AG} ану (kJ/mol) Substance U/mol-K) Substance U/mol-K) 96.11 A8CI(s) Ag20(s) AGNO,(s) -127.0 -109.70 Phosphorus (cont.) Plg) Pa(s, red) Pa(s, white) PCly(g) PC() PFs(g) PH3(g) P,O6(s) P,O10(s) POCI(g) -31.05 -11.20 121.3 58.9 24.4 280 -124.4 -33.41 140.9 -17.46 -12.03 22.85 41.08 Sodium 77.3 153.7 -288.07 -319.6 -269.6 311.7 107.7 Na(g) Na(s) Na*(aq) Na*(g) NaBr(aq) NaBr(s) NazCOs(s) NaCl(aq) NaCl(g) NaCl(s) NAHCO,(s) NANO3(ag) NANO3(6) NaOH(aq) NaOH(s) -272.4 217 51.45 -1594.4 -1520.7 300.8 -240.1 -261.9 59.0 5.4 13.4 210.2 609.3 574.3 148.0 -1640.1 -360.6 -364.7 141.00 -2940.1 -2675.2 228.9 -361.4 -349.3 86.82 136.0 1130.9 -407.1 -542.2 -502.5 325 -1047.7 -597.0 -520.9 222 -393.0 115.5 POCI() НРОдаg) -1288.3 -1142.6 158.2 -181.4 -201.3 229.8 -410.9 -384.0 72.33 Potassium -947.7 -851.8 102.1 89.99 61.17 160.2 K(g) K(s) KCI(s) KCIO,(s) KCIO,(ag) KĄCO(s) KNO,(s) KO(s) KO,(s) KO2(s) КОН(6) коНод) -446.2 -372.4 207 64.67 -467.9 --367.0 116.5 435.9 --408.3 82.7 49.8 -469.6 -425.6 -419.2 -391.2 -289.9 143.0 -379.5 64.46 --349.5 --284.9 265.7 -1150.18 -1064.58 155.44 Strontium -592.0 561.9 54.9 -492.70 -363.2 -393.13 132.9 SrO(s) --322.1 94.14 Sr(g) 164.4 110.0 164.6 -284.5 -240.6 122.5 Sulfur S(s, rhombic) S(g) SO(3) SO,(8) So,*"(aq) SOCI;() HSg) HSO,(ag) HSO,() --495.8 -429.8 113.0 31.88 -424.7 -378.9 78.91 162.3 49.7 430.9 -482.4 -440.5 91.6 -296.9 -300.4 248.5 --395.2 -370.4. 256.2 Rubidium -909.3 -744.5 20.1 170.0 76,78 85.8 55.8 Rb(g) Rb(s) RЬCI(:) -245.6 -20.17 -909.3 -33.01 205.6 -430.5 -412.0 92 -744.5 20.1 RBCIO,(s) -392.4 -292.0 152 -814.0 -689.9 156.1 Scandium Titanium 377.8 336.1 174.7 Scg) Sc(s) 468 422 180.3 Ti(g) Ti(s) 34.6 30.76 354.9 221.9 -763.2 -726.8 ПC48) TICL4() TIO2(8) Selenium H,Selg) 29.7 15.9 219.0 -804.2 -728.1 -944.7 -889.4 50.29 Silicon 368.2 323.9 167.8 Vanadium Si(g) Si(s) SIC(S) SICL() SIO2(s, quartz) 18.7 514.2 453.1 182.2 -73.22 --70.85 16.61 V(s) 28.9 239.3 41.84 -640.1 -572.8 Zinc -910.9 -856.5 130.7 95.2. 160.9 Zng Zn(s) ZnClą(s) ZnO(s) 41.63 Silver --415.1 --369.4 111.5 42.55 Ag(s) Ag (aq) -348.0 -318.2 43.9 105.90 77.11 73.93 1113 Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) APPENDIX C Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) AH? (kJ/mol) AG (kJ/mol) S° AG (kJ/mol) Şubstance (kJ/mol) U/mol-K) Substance U/mol-K) -569.6 26.8 -205.9 -156.1 MgO(s) Mg(OH)2(s) 108.1 -601.8 CuCla(s) CuO(s) Cuz0(s) - 161.7 -128.3 42.59 -924.7 -833.7 63.24 -170.7 -147.9 92.36 Manganese Mn(g) Mn(s) MnO(s) Fluorine 280.7 238.5 173.6 80.0 61.9 158.7 32.0 F(g) F"(aq) F2lg) HF(g) -362.9 -464.8 -332.6 -278.8 -13.8 -385.2 59.7 -519.6 -541.4 202.7 MnO2(s) 53.14 -268.61 -270.70 173.51 MnO, (ag) --447.2 191.2 AG? AG? (kJ/mol) AH) AH) (kJ/mol) Hydrogen H(g) H*(aq) H*) H2) Mercury Hg(g) Hg() HgCl2(s) Hg2Cl2(s) (kj/mol) (kJ/mol) U/mol-K) Substance 0/mol-K) Substance 217.94 203.26 114.60 60.83 31.76 174.89 52.30 68.11 219.4 77.40 Сан(8) C3H3) C,Ha(8) CH16(8) CH10(1) CHol8) Aluminum 28.32 -84.68 -32.89 229.5 1536.2 1517.0 108.9 -230.1 -184.0 144.5 Al(s) AICly(s) AlzOs(s) -705.6 -630.0 109.3 - 103.85 -23.47 269.9 130.58 -264.9 -210.5 192.5 -1669.8 -1576.S 51.00 -124.73 -15.71 310.0 Iodine Nickel -147.6 --15.0 231.0 106.60 70.16 180.66 429.7 384.5 182.1 I(g) r(aq) Ig) 2(s) HI(g) Ni(g) Ni(s) NIC2(s) NiO(s) Barium 82.9 129.7 269.2 29.9 63.2 -55.19 -51.57 111.3 Ba(s) BaCO(s) BaO(s) 49.0 124.5 172.8 62.25 260.57 -305.3 -259.0 97.65 19.37 -1216.3 -1137.6 112.1 CнHоне) CHОН() CаHоне) CHSOH() CH12O6(s) COg) CO2{8) CH,COОН() -201.2 -161.9 237.6 116.73 -239.7 -211.7 37.99 -553.5 -525.1 70.42 -238.6 --166.23 126.8 25.94 1.30 206.3 Nitrogen N(g) Nzg) NH3(aq) NH3(8) NH, (aq) N2H4(g) NH,CN(6) NH,CI(s) NH,NO3(4) NO(g) NO2(8) N2O(g) NO,(8) NOCI(g) HNO3(aq) HNO,(g) -168.5 282.7 Berylium Be(s). BeO(s) Be(OH)2(s) -235.1 9.44 -277,7 174.76 160.7 Iron 472.7 455.5 153.3 415.5 369.8 180.5 191.50 Felg) Fe(s) Fe2"(aq) Fe"(aq) -608.4 -579.1 13.77 -1273.02 -910.4 212.1 27.15 113.4 -905.8 -817.9 50.21 -110.5 -137.2 197.9 --80.29 -26.50 111.3 -87.86 -84.93 -46.19 - 16.66 192.5 -393.5 -487.0 -394.4 213.6 Bromine -47.69 - 10.54 293.3 -132.5 -79.31 113.4 -392.4 159.8 111.8 82.38 174.9 Br(g) Br"(aq) Br2(g) -341.8 -302.3 117.9 159.4 238.5 FeCh(s) FeCly(s) FeO(s) Fe,O,(s) Fe,O(s) FeS2(s) 95.40 -120.9 -102.8 80.71 Cesium -400 -334 142.3 0.0 30.71 3.14 245.3 76.50 49.53 175.6 Cslg) Cs() -271.9 -255.2 60.75 -314.4 -203.0 94.6 92.07 85.15 152.3 2.09 0.03 -822.16 -1117.1 -740.98 89.96 -365.6 --184.0 151 ABr(g) -36.23 -53.22 198.49 Cs(s) CSCI(s) -1014.2 146.4 90.37 86.71 210.62 --442.8 -414.4 101.2 -160.1 52.92 240.45 Calcium -171.5 33.84 51.84 179.3 145.5 154.8 81.6 103.59 220.0 Ca(g) Ca(s) CaCO,(s, calcite) CaCla(s) CaF2(s) CaO(s) Ca(OH)2(s) CasO,(s) Chlorine Lead 41.4 121.7 105.7 165.2 9.66 98.28 304.3 CI(g) CI"(aq) C2(g) НClag) HC(g) 68.85 Pb(s) РЪВrs(9) РЬСО,) -1207.1 -1128.76 92.88 -167.2 -131.2 56.5 -277.4 -260.7 161 52.6 66.3 264 -795.8 -748.1 104.6 222.96 -206.6 -110.5 146 699.1 -625.5 131.0 -1219.6 -1167.3 68.87 -167.2 -131.2 56.5 --246.9 303.3 -134.3 -73.94 266.4 Pb(NOsh(aq) Pb(NO,)2(s) PbO(s) -421.3 -635.5 -604.17 39.75 -92.30 -95.27 186.69 -451.9 Oxygen Og) Olg) Os(8) OH (aq) -986.2 -898.5 83.4 Chromium -2173 -187.9 68.70 247.5 230.1 161.0 -1434.0 -1321.8 106.7 397.5 352.6 174.2 205.0 Cr(g) Cr(s) CryOs(s) Lithium Carbon 23.6 Li(g) 159.3 126.6 138.8 142.3 163.4 237.6 718.4 672.9 158.0 -1058.1 81.2 -230.0 -157.3 -10.7 Cg) C(s, diamond) C(s, graphite) CCL(8) CC4() CF(g) CH,8) Сн8) -1139.7 29.09. Li(s) Li*(aq) Li"(g) LICI(6) 1.88 2.84 2.43 -241.82 -228.57 188.83 69.91 Н.Os) Н.О() HO28) H2O2(g) -278.5 685.7 Cobalt -273.4 12.2 5.69 -285.83 -136.10 -237.13 -105.48 439 393 179 648.5 133.0 Co(g) Co(s) -106.7 -64.0 309.4 28.4 -408.3 -384.0 59.30 232.9 - 139.3 -68.6 214.4 - 187.8 -120.4 109.6 Copper Cutg) Cu(s) Magnesium Mg(g) Mg(e) MgCl2(s) -679.9 635.1 262.3 148.6 166.3 33.30 Phosphorus P(g) P2(g) -74.8 -50.8 186.3 338.4 298.6 147.1 112.5 32.51 316.4 280.0 163.2 226.77 209.2 200.8 -641.6 -592.1 89.6 144.3 103.7 218.1 1112 APPENDIX C Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) 1114 Ане APPENDIX
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
Polarity Of Water
In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
Using appendix C values, calculate the delta H
for the following reactions:
4NH3(g) + O2(g) -->2N2H4(g) + 2H2O(l)
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