entropy

Use the Standard Thermodynamic Properties table to calculate AH° for the following reaction: B2H6 (g) + 3 O2 (9) → B2O3(s) + 3 H2O(1) kJ

Consider each of the following reactions and decide whether the standard entropy change for the reaction will be, (a) Negative; or (b) Positive; or (c) Very close to Zero. Cu (s) + 2 H2S04 (aq) = CuSO4 (aq) + 2 H20 (1) + SO2 (8) 2 Na (I) + H2 (g) = 2 NaH (s) 1. negative Mg (s) + CO2 (g) = MgO (s) + CO (g) 2. positive 2 H20 (I) = 2 H2 (g) + O2 (g) 3. very close to zero N2 (g) + 3 H2 (g) = 2 NH3 (g) NH3 (g) + HCI (g) = NH4CI (s) > > >

The reduction of iron(III) oxide (Fe2O3) to pure iron during the first step of steelmaking, 2 FeO3(s) 4Fe(s) + 302(g) is driven by the high-temperature combustion of coke, a purified form of coal: C(s) + O2(g) → CO₂ (g) -> 11 ✓12 Suppose at the temperature of a blast furnace the Gibbs free energies of formation AG, of CO2 and Fe2O3 are -447. kJ/mol and -818. kJ/mol, respectively. Calculate the minimum mass of coke needed to produce 7800. kg of pure iron. Round your answer to 2 significant digits. kg 5