1 Dalton’s Law John Dalton 1766-1844 Chapter 12 : Day 4.

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Presentation transcript:

1 Dalton’s Law John Dalton Chapter 12 : Day 4

2 DALTON’S Law PARTIAL PRESSURES Total pressure equals the sum of the parts INDEPENDENT of composition

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4 Dalton’s Law of Partial Pressures What is the total pressure in the flask? P total in gas mixture = P A + P B +... Therefore, P total = P(H 2 O) + P(O 2 ) = 0.48 atm Dalton’s Law: total P is sum of PARTIAL pressures. 2 H 2 O 2 (liq) ---> 2 H 2 O(g) + O 2 (g) 0.32 atm 0.16 atm 0.32 atm 0.16 atm

5 Mole Fraction Partial pressure is proportional to the mole fraction of any gas  a = __n a _____ = n a _ n a + n b + n c n total  a = __P a _ = n a _ P total n total

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