class9 - Class #9 Gases & Stoichiometry CHEM 107 A. Bengali...

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Class #9 CHEM 107 A. Bengali Texas A&M University Qatar
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Gas Law ) A “warm-up” problem, from an old exam ) “Clouds” in deep space contain 10 10 H 2 molecules per m 3 , at 25 K ) Find P in atmospheres
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Gas Cloud Problem ) P=nRT/V = (n/V)RT ) (n/V) = 10 10 molecules/m 3 ) That’s 1.66x10 -14 mole/m 3 or 1.66x10 -17 mol/L ) Then solve for P, get 3.4x10 -17 atm.
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) Chemical equations relate #’s of moles, as always! ) Gas law relates # of moles to P, V, T ) Allows us to find amount of gas produced or consumed in terms of P, V, T, . ...
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Gas Stoichiometry ) Mg dissolves in HCl, produces H 2 Mg (s) + 2H 3 O + (aq) Mg 2 + (aq ) + H 2 (g) +2H 2 O ) Dissolve 2.0 g Mg in excess HCl ) Predict volume of H 2 produced
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Mg/HCl Mg (s) + 2H 3 O + (aq) Mg 2 + (aq )+H 2 (g) +2H 2 O Use P = 1 atm, T = 25 C = 298 K 2 g ? L First get moles of H 2 2 g Mgx 1 mol Mg 24.3 g Mg x 1 mol H 2 1 mol Mg = 0.0823 mol H 2
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Mg/HCl ) 0.0823 mol H 2 = ? L at 1 atm, 25 C V= nRT P = ( 0 . 0823 )( 0 . 0821 )( 298 ) 1 =2 . 01 L
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This note was uploaded on 03/29/2008 for the course CHEM 107 taught by Professor Generalchemforeng during the Spring '07 term at Texas A&M.

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class9 - Class #9 Gases & Stoichiometry CHEM 107 A. Bengali...

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