Question

Write down as many correct, distinct, and relevant facts you In the reaction, below 23.0 g of FeClb at 25.0 Celsius (assume 1.0 g/mL) can about undergoes the reaction in 5.15 L of water initially FeCb(s) ? Fe-(aq) + 2 Cr(aq) AHCFer_-87 9 kJhmol aHr(FeCl2)--34 1 8 kJrnol AH(Cr)--167 46 kJmol Each statement you use should refer to material that has been presented in this course. You can use outside information (such as other reference material) but that will only count as one statement, regardless of how much information is presented from other sources. You'll receive 1 int for each statement. Seven statements will get you full credit for the problem

Answer 1

This is the dissociation reaction in which one molecule get dissociated into ions => molar mass of Fecl_2 = 126.751 g/mol given mass of Fecl_2 = 23g => No. of moles of Fecl_2 = 23g/126.751 g/mol = 0.18/moles of fecl_2 There will be 0.181 moles of fecl_2 fecl_2(3) rightarrow fecl_2(aq) rightarrow fe^2+(aq) + 2cr^-(aq) 1mole 1mole 2mole, => so, 0.181 moles of fecl_2 will dissociate into 0.181 moles of fe^2+ ions in final solution = 0.181moles/5.15 = 0.035 mol/L Concentration of cl^- ions in final solution = 0.362 moles/5.152 = 0.070mol/L => given heat of reaction of each component in the reaction. -delta Hf (fecl_2) = -341.8 kj/mol -delta Hf (fe^2+) = -87.9 kj/mol -delta hf(cl^-) = -167.46 kj/mol delta Hrnx = (delta Hf (fe^2+) + delta Hf(cl -1) - delta Hf (fecl_2) (-87.96 kj/mol - 187.48kj/mol)- (-3418 kj/mol) = 86.44kj/mol => heat of reaction delta Hrnx = 86.44 kj/mol of fecl_2 => it is endothermic reaction as delta hrnx is positive When we add fecl_2 to water the temperature of solution will be reduced from 25