Question

- - the reaction Po l o-scilo). Please remember to click "Submit Answer 2017() 0,(0) -->0,000) F,00) AH - 167.40 0,00) 35,0() --> 2017(e) +20,(9) AH = -341.4 25,0() --> 2F(0) + O2(e) AH-43.43 434.8 465.43 434.8k 217.4 . -217.4) S A Tries / 10. Suppose you a coffee cup (Syrofoam) up with water and perform the following tasks at room temperature in how many of these situations would you expect the temperature of the water solution) In the calorimeter to decrease? Please remember to click "Submit Answer" Place ice cubes into the water Dissolve pottasium charide (KOH) KOI CA 3.903) Perform an exothermic neutralization reaction in the calorimeter Place dryke (T-78.5°C) into the water causing the dry ice to vaporire, (Demo from clase Tres / 11. Based on the direction and amount of heat flowing in the following equations, which equation would allow you to determine the heat of formation of the compound NOCKO) Please remember to clie "Submit Answer N2(0)+(0)* N,(9)+0,(9)+ (0) -->2NOCH) (0) --> NOCI

Answer 1

Q9. Correct option is : -434.8 kJ

Q10. Correct option is : 3

Q11. Correct option is : 1/2 N2 (g) + 1/2 O2 (g) + 1/2 Cl2 (g) $\rightarrow$ NOCl (g)

Explanation

Q9. Reaction 1 : 2 ClF (g) + O2 (g) $\rightarrow$ Cl2O (g) + F2O (g) : $\Delta$ H1 = 167.4 kJ

Reaction 2 : Cl2O (g) + 3 F2O (g) $\rightarrow$ 2 ClF3 (g) + 2 O2 (g) : $\Delta$ H2 = -341.4 kJ

Reaction 3 : 2 F2O (g) $\rightarrow$ 2 F2 (g) + O2 (g) : $\Delta$ H3 = 43.4 kJ

Desired reaction : 4 ClF (g) + 4 F2 (g) $\rightarrow$ 4 ClF3 (g)

Consider the opration : 2 * (Reaction 1 + Reaction 2 - Reaction 3)

This operation gives the desired reaction in terms of other 3 reactions

$\Delta$H = 2 * ($\Delta$H1 + $\Delta$ H2 - $\Delta$ H3)

$\Delta$H = 2 * (167.4 kJ - 341.4 kJ - 43.4 kJ)

$\Delta$H = 2 * (-217.4 kJ)

$\Delta$H = -434.8 kJ