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Chapter 5 Gaseous State (Lecture 7-10) (Part 2)done

# Chapter 5 Gaseous State (Lecture 7-10) (Part 2)done -...

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Tutorial Question: One of the important reactions in the nitrogen fertilizer producing process is the oxidizing of ammonia. 4NH 3 (g) + 5O 2 (g) 4NO(g) + 6H 2 O(g) If 3.00-L of ammonia at 802 ° C and 1.30 atm react completely with oxygen, what volume (in litres) of water vapour will be produced at 125 ° C and 1.00 atm? What volume of oxygen (in dm 3 ) measured at 25 ° C and 90.7 kPa that will produce 100 dm 3 of NO at 500 ° C and 100 kPa?

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5.5 Gas Mixture and Partial Pressures John Dalton (1801): In a mixture of unreactive gases in a flask The pressure exerted by a gas is called Partial pressure of the gas Gas A : n A mol , P A Gas A : n A mol , P A Gas B : n B mol , P B
5.5 Gas Mixtures; Law of Partial Pressures V and T are constant P 1 P 2 P total = P 1 + P 2

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In a flask containing a mixture of gases Gas A, gas B, gas C Each individual partial pressure(P A , P B , P C ) If all follow the ideal gas law P A V = n A RT etc. n A is the number of moles of gas A Gas A : n A mol , P A Gas B : n B mol , P B Gas C : n C mol , P C P = P A + P B + P C
Consider a case in which two gases, A and B , are in a container of volume V. P A = n A RT V P B = n B RT V n A is the number of moles of A n B is the number of moles of B P T = P A + P B X A = n A n A + n B X B = n B n A + n B P A = X A P T P B = X B P T P i = X i P T

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5.5.1 Dalton’s Law of Partial Pressures (Important) Dalton’s law of partial pressures: The sum of the partial pressures of all the different gases in a mixture is equal to total pressure of the mixture P = P A + P B + P C + ….. P is the total pressure of the mixture P A , P B , P C , … partial pressures of component gases
5.5.2 Mole Fraction of a Component Gas Mole fraction of a component gas in a mixture Equals partial pressure

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