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c161l19_10_15

# c161l19_10_15 - Summary Summary First law conservation of...

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Summary Summary W First law - conservation of energy W Heat lost = heat gained q=ms Δ T=±C± Δ T = -n Δ H W Enthalpy - heat at constant pressure Extensive State function Hess’s Law Δ H = ΣΔ H f (Products)- ΣΔ H (Reactants)

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Which concept was hardest Which concept was hardest 1. Energy and work 2. State functions 3. Calorimetry 4. Enthalpy 5. Hess’s Law
Old Old Question Question W Given the following data: W H 2 (g) + ½O 2 (g) H 2 O(l) Δ H = -286 kJ W 2 Na(s) + ½O 2 (g) Na 2 O(s) -414 W Na(s) + ½ O 2 (g) + ½ H 2 (g) NaOH(s) -425 W Based on the information above, what is Δ H for the following reaction? W Na 2 O(s) + H 2 O(l) 2NaOH(s) A. -1,125 kJ B. -978 kJ C. -722 kJ D. +275 kJ E. -150 kJ

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Solution Solution W 2Na(s) + O 2 (g) + H 2 (g) 2NaOH(s) -850 W Na 2 O(s) 2 Na(s) + ½O 2 (g) 414 W H 2 O(l) H 2 (g) + ½O 2 (g) Δ H = 286 kJ
Another question Another question W Consider the following equations with Δ H data, with hypothetical molecules A,B, and AB:

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c161l19_10_15 - Summary Summary First law conservation of...

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