substance H f ° (kJ/mol) G f ° (kJ/mol)S ° (J/molK)AluminumAl 3+ (aq)----485.0--
ID: 1083719 • Letter: S
Question
substance
Hf
°
(kJ/mol)
Gf
°
(kJ/mol)S
°
(J/molK)AluminumAl3+ (aq)----485.0---Al (s)0028.3Al2O3 (s)-1675.7-1582.350.9Al(OH)3 (s)----1147.25---BromineBr (aq)----104.0---Br2 (l)00152.2Br2 (g)30.93.1245.5HBr (g)-36.3-53.4198.7CalciumCa2+ (aq)----553.6---CaCl2 (s)-795.4------CaO (s)-634.9------Ca(OH)2 (s)-985.2------Ca3(PO4)2 (s)----3884.7---CarbonC (s)005.7CCl4 (g)-95.7-64.0309.4CCl4 (l)-128.2-68.6214.4CCl4 (s)-136.8------CH4 (g)-74.6-50.5186.3C2H2 (g)227.4------C2H6 (g)-84.0------C3H8 (g)-103.85-23.4270.3C4H10 (g)-125.7-15.7310.0C4H10 (l)-147.3-15.0231.0C6H6 (l)49.1124.5173.4C6H6 (g)82.9129.7269.2CH3OH (l)-239.2-166.6126.80CH3OH (g)-201.0-162.3239.9(CH3)2(CH2)2O (l)-279.5-346.74253.5C6H12O6 (s)-1237.3-910.4212.1CO (g)-110.5-137.2197.7CO2 (g)-393.5-394.4213.8C2H5OH (l)-277.6-174.8160.7C2H5OH (g)-234.8-167.9281.6HCH3CO2 (l)-484.3-389.9159.8HCH3CO2 (s)-472.8------HCH3CO2 (g)-432.2---283.5HCN (l)108.9125.0112.8HCN (g)135.1124.7201.8CS2 (s)93.8------CS2 (l)89.064.6151.3CS2 (g)116.767.1237.8ChlorineCl2 (g)00223.1Cl (aq)----131.2---HCl (aq)-167.------HCl (g)-92.3-95.3186.9ChromiumCrO42 (aq)----727.8---FluorineF2 (g)00202.8HF (g)-273.3-275.4173.8HydrogenH2 (g)00130.7IronFe (s)0027.3FeCl3 (s)-399.5-334.0142.3Fe2O3 (s)-824.2-742.287.4LeadPb2+ (aq)----24.4---PbBr2 (s)-278.7-261.9161.5PbS (s)-100.4-98.791.2PbSO4 (s)-920.0-813.0148.5MagnesiumMgCl2 (s)-641.3-591.889.6MgO (s)-601.6-569.327.0MercuryHg (g)61.431.8175.0Hg (l)0075.9Hg (s)-2.29------Hg22+ (aq)---153.5---Hg2Cl2 (s)----210.7---NitrogenN2 (g)00191.6N2H4 (g)95.4159.4238.5N2H4 (l)50.6149.3121.2NH3 (g)-45.9-16.4192.8NH3 (l)-69.54-26.5095.09NH4NO3 (s)-365.6-183.9151.1NO (g)91.387.6210.8NO2 (g)33.251.3240.1NOCl (g)51.766.1261.7N2O4 (g)11.199.8304.4HNO2 (g)-79.5------HNO3 (l)-174.1-80.7155.6HNO3 (g)-133.9-73.5266.9OxygenOH (aq)----157.2---H2O (l)-285.8-237.170.0H2O (g)-241.8-228.6188.8O2 (g)00205.2H2O2 (l)-187.8-120.4109.6H2O2 (g)-136.3-105.6232.7PhosphorusP4 (s)0041.P4 (g)58.924.4280.0PCl3 (g)-287.0-267.8311.8PCl3 (l)-319.7-272.3217.1PF5 (g)-1594.4-1520.7300.8PO43 (aq)----1018.7---H3PO4 (l)-1271.7------H3PO4 (s)-1284.4-1124.3110.5P4O10 (s)-2984.-2675.2228.9PotassiumKBr (s)-393.4-380.795.9KNO3 (s)-492.7-393.13132.9SilverAg+ (aq)---77.1---Ag2CrO4 (s)----641.8---SodiumNaCl (s)-411.2------NaOH (s)-425.8------SulfurS8 (s)0032.0H2S (g)-20.6------H2SO4 (l)-814.0------SF6 (g)-1220.5-1116.5291.5TinSn (s)0051.2SnO2 (s)-577.6-515.849.0TitaniumTiCl4 (g)-763.2-726.3353.2TiCl4 (l)-804.2-737.2252.3TiO2 (s)-944.0-888.850.6
) solid, 0.175 M calcium (Ca) aqueous solution, and 0.588 M A chemist fills a reaction vessel with 0.235 g calcium phosphate phosphat aqueous solution at a temperature of 25.0°C. Under these conditions, calculate the reaction free energy AG for the following chemical reaction: Ca, (PO.),(6) 3ca? *(aq) + 2PO} (aq) Use the thermodynamic information in the ALEKS Data tab. Round your answer to the nearest kilojoule. xr?Explanation / Answer
DG0 = ((3*-553.5)+(2*-1018.8)) - (-3875.6)
= 177.5 kj
DG = DG0+RTlnQ
DG = DG0 + RT ln[Ca2+]^3[PO4^3-]^2
= (177.5*10^3)+(8.314*298)ln(0.175^3*0.588^2)
= 161.91 kj
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