Lecture6_S08

# Lecture6_S08 - Lecture 6 One can purchase a 3 wt H 2 O 2...

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Unformatted text preview: Lecture 6 One can purchase a 3 wt% H 2 O 2 solution (in water) from the grocery store. Prof Gardinier can purchase a 30 wt% solution from various chemical companies. What is the molarity of each? 3 wt% M = 3.0 g H 2 O 2 1.0 g soln 1000 mL 1mol H 2 O 2 100 g soln 1 mL soln 1 L 34.01 g H 2 O 2 density = 1.0 g/mL = 0.88 mol/L 30 wt% M = 30 g H 2 O 2 1.11 g soln 1000 mL 1mol H 2 O 2 100 g soln 1 mL soln 1 L 34.01 g H 2 O 2 density = 1.11 g/mL = 9.8 mol/L Concentration is greater than 10X because density is higher than 1.0 g/mL Why does H 2 O 2 froth on adding to cut or to soln containing I- ? Is H 2 O 2 thermodynamically stable? That is, is the following reaction spontaneous ( Δ G is negative)? 2 H 2 O 2 (aq) 2 H 2 O (l) + O 2 (g) Analyze the parts of: Δ G = Δ H - T Δ S Δ H = bonds broken – bonds formed = 4 O-H and 2 O-O bonds broken- 4 OH bonds formed – double O=O bond formed Δ H is about zero – this is a wash Δ S = # particles formed – # particles consumed = formed 3 moles from 2 moles! Also formed gas from condensed state= formed 3 moles from 2 moles!...
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Lecture6_S08 - Lecture 6 One can purchase a 3 wt H 2 O 2...

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