05 HW - Hess's Law

05 HW - Hess's Law - (g) + NiCl 2 (s) H= +150 kJ SOCl 2 (g)...

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Name: _________________________________________ Date: ____________ WKST #2: Hess’s Law (35 points) Period: __________ 1. Enthalpy is a state function. What does this mean? Provide another example of a state function. 2. Explain Hess’s law in your own words. DO NOT COPY FROM YOUR NOTES! 3. If enthalpy was not a state function, would Hess’s law apply? Explain your answer. Follow the procedure below receive full credit for each Hess’s Law question: Rewrite the reactions and their enthalpy values in the form that you need them (this includes coefficients were applicable) Cancel out the species that are not found in the final equation State if the reaction is exothermic or endothermic Place a BOX around your final enthalpy value so that I can find it easily 4. Ca(OH) 2 (s) + CO 2 (g) CaCO 3 (s) + H 2 O (l) H = ? CaO (s) + CO 2 (g) CaCO 3 (s) H = -178 kJ CaO (s) + H 2 O (l) Ca(OH) 2 (s) H = -65 kJ 5. NiO (s) + 2 HCl (l) NiCl 2 (s) + H 2 O (g) H = ? SOCl 2 (g) + NiO (s) SO 2
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Unformatted text preview: (g) + NiCl 2 (s) H= +150 kJ SOCl 2 (g) + H 2 O (g) SO 2 (g) + 2 HCl (l) H = -27 kJ If you need more room to solve the problem, staple addition sheets of paper to the worksheet! 6. 3Fe 2 O 3 (s) + CO(g) 2Fe 3 O 4 (s) + CO 2 (g) H = ? Fe 2 O 3 (s) + 3CO(g) 2Fe(s) + 3CO 2 (g) H= -23 kJ Fe 3 O 4 + CO(g) 3FeO(s) + CO 2 (g) H= -18kJ Fe(s) + CO 2 (g) FeO(s) + CO(g) H= -1kJ 7. H 2 O(l) +SO 2 (g) H 2 SO 3 (l) H = ? H 2 S(g) + 3/2O 2 (g) H 2 SO 3 (l) H= -459 kJ SO 2 (g) S(s) + O 2 (g) H= +668.3 kJ S(s) + H 2 O(l) H 2 S(g) + 1/2O 2 (g) H= +348.7 kJ Challenge Question! (5 points) 2 SO 2 (g) + 2 P(s) + 5 Cl 2 (g) 2 SOCl 2 (l) + 2 POCl 3 (l) H = ? SOCl 2 (l) + H 2 O(l) SO 2 (g) + 2 HCl(g) H = +10.3 kJ/mol PCl 3 (l) + 1/2 O 2 (g) POCl 3 (l) H = -325.7 kJ/mol P(s) + 3/2 Cl 2 (g) PCl 3 (l) H = -306.7 kJ/mol 4 HCl(g) + O 2 (g) 2 Cl 2 (g) + 2 H 2 O(l) H = -202.6kJ/mol...
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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05 HW - Hess's Law - (g) + NiCl 2 (s) H= +150 kJ SOCl 2 (g)...

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