Chapter 6 4 Ar s50°C, Caco3 undergoes substantial decomposition to yield CaO and

Question

Chapter 6 4 Ar s50°C, Caco3 undergoes substantial decomposition to yield CaO and CO2. Assuming that the enthalpy change (in k) if 64.50 g of Co2 is produced in one reaction. of the reactant and products are the same at 850°C as they are at 25°C, caleulate the k.J (14). Enter your answer in the provided box Caleulate the standard enthalpy of formation of carbon disulfide (CS2) from it's elements, given that C(graphite) + O2(g) CO2(g) S(rhombic)+O2(g) SO2(g) CS2 + 302(g) CO2(g) + 2SO2(g) AHorx n =-393.5 kJ/mol 1l orxn--296.4 kJ/mol All orn = k.J/mol (15). Enter your answer in the provided box A quantity of 2.00 × 102 mL of 0.853 M HCl is mixed with 2.00 x 102 mL of 0.427 M Ba(OH)2 in a constant-pressure calorimeter of negligible heat capacity. The initial temperature of the HCI and Ba(OH)2 solutions is the same at 20.27°C. For the process below, the heat of neutralization is-56.2 kJ/mol. What is the final temperature of the mixed solutions? H+(aq) + OH-(aq) H2O(l) oC

Explanation / Answer

14.

do (1) * 1 + (2) * 2- 3 to get the eqution of formation of CS2,

C (s) + 2 S (s) -----------> CS2

deltaH = deltaH1 + 2 * deltaH2 - deltaH3

deltaH = - 393.5 + 2 (-296.4) - ( - 1073.6) = 87.3 kJ/mol

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