Ex 2 Sp07 - A1-1CHM 2046PRACTICE EXAM 2, FORM CODE A1. In...

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Unformatted text preview: A1-1CHM 2046PRACTICE EXAM 2, FORM CODE A1. In the equation for the chemical reaction at 25C which corresponds to Gfforcalciumfluorapatite (Ca5(PO4)3F), the total number of moles of solid-phase reactants is(1) 5(2) 23/4(3) 6(4) 7/8(5) 12-1/4.2. Of the following listed systems at 25C, CaSO42H2O(s) should be least soluble in(1) 1MNa2SO4(2) 1MKHSO4(3) 1MH2SO4(4) 0.5MCaCl2(5) 1M(NH4)2SO4.3. For: H2O(l)-H2O(g) at 90C,(1)Patmospheric<1 atm(2)PH2O(g)> V PH2O(l)(3) Gr= 0(4) Hris +, Sris +(5) Hris-, Sris-.4. For: CaCO3(s) + 2 HF(aq)CaF2(s) + H2CO3(aq),Kis closest to(1) 9.10-11(2) 7.107(3) 2.61012(4) 1.(5) 8.9104.5. The shells of marine organisms contain calcium carbonate, mostly in a crystalline form knownas calcite (fH=-1207.6 kJ/mol;Sf= 91.7 J/(mol K) at 298 K). A second crystalline formof calcium carbonate is known as aragonite (fH=-1207.8 kJ/mol;Sf= 88.0 J/(mol K)at 298 K). The standard Gibbs free energy of the conversion of calcite into aragonite at T =298 K is closest to:(1) 1207.7 kJ/mol(2) 3.7 kJ/mol(3) 0.0 kJ/mol(4) -199.9 J/mol(5) 902.6 J/mol .6. The following reaction studied at 25C for which Gris - is(1) BaCO3(s)-Ba2+(aq) + CO32-(aq)(2) NaCl(s)-Na(s) + 1/2 Cl(g)(3) HCN(aq) + H2O(l)-H3O+(aq) + CN-(aq)(4) CaCO3(s) + 2 HF(aq)-CaF2(s) + H2CO3(aq)(5) 2 OH-(aq)-H2O(l) + O2-(aq)....
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Ex 2 Sp07 - A1-1CHM 2046PRACTICE EXAM 2, FORM CODE A1. In...

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