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Experimental measurements of rxn rates

Experimental measurements of rxn rates. Volume Changes of a Gas eudiometer. Zn (s) + 2HCl (aq) → H 2(g) + ZnCl 2(aq). Rate in mL/s H 2. Rate in mol/min for H 2. Rate in g/h for HCl. Volume (mL). 8 7 6 5 4 3 2 1 0. Rise: 8.3-4 = 4.3. Slope= Rise/Run=

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Experimental measurements of rxn rates

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  1. Experimental measurements of rxn rates

  2. Volume Changes of a Gas eudiometer Zn(s) + 2HCl(aq) → H2(g) + ZnCl2(aq)

  3. Rate in mL/s H2 Rate in mol/min for H2 Rate in g/h for HCl

  4. Volume (mL) 8 7 6 5 4 3 2 1 0 Rise: 8.3-4 = 4.3 Slope= Rise/Run= 4.3/75= 0.057 mL/s Run: 75-0 = 75 15 30 45 60 75 (time sec)

  5. Changes in Pressure (constant volume or sealed container) • if more moles of gas (coefficient) in products, pressure will go up Zn(s) + 2HCl(aq)  H2(g) + ZnCl2(aq) ____m.o.g. ____ m.o.g. • If more MOG in reactants, pressure will __________________________ • rate = ∆ pressure (constant volume) ∆ time 

  6. If equal MOG, pressure will not change:  NO2(g) + CO(g)  CO2(g) + NO(g) 2 m.o.g. 2 m.o.g.

  7. Mass of an open container {Changes in Mass} CaCO3(s) + 2HCl(aq) → CO2(g) + CaCl2(aq) + H2O(l)

  8. CaCO3(s) + 2HCl(aq) → CO2(g) + CaCl2(aq) + H2O(l) 1. Calculate the rate in units of grams/s for CO2 2. Calculate the rate in grams/h forCaCO3

  9. Hebden p 5 exercises: 7-9 + Page 11 questions

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