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chap-13-2011W-a

# 3 po2 1atm21 021atm c 2 h 6 e th a n e 1 8 c 2

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Unformatted text preview: es at 250C. G as S o lu b ility ( m M ) Analysis: at 1atm, C H 4 ( M eth a n e ) 1 .3 PO2 = 1atm×21% = 0.21atm C 2 H 6 ( E th a n e ) 1 .8 C 2 H 4 ( E th ylen e ) 4 .7 N2 0 .6 O2 1 .2 NO 1 .9 H 2S 99 SO2 1476 PO 2 = 1 a tm , S O 2 = 1 .2 m M PO 2 = 0 .2 1 a tm , S O 2 = ? S g a s = k ⋅ Pg a s S g a s1 S gas 2 = Pg a s 1 Pg a s 2 1 a tm 1 .2 m M = 0 .2 1 a tm xm M x = 1 .2 m M × 0 .2 1 = 0 .2 5 2 m M = 2 .5 2 × 1 0 − 4 M At 1atm, the concentration of O2 in Si Yuan lake is2.52×10-4M Solution Concentration Solution Concentration Different concentration units: Mass Mass percentage Parts per million Parts per billion Mole Fraction Molarity Molality （质量摩尔浓度） Concentration Units The concentration of a solution is the amount of solute present in a given quantity of solvent or solution. Mass percentage: % b y m a ss m a ss o f so lu te ( g ) = ×100% m a ss o f so lu te ( g ) + m a ss o f so lven t ( g ) m a ss o f so lu te = ×100% m a ss o f so ln Mole Fraction (XA) X A M o le o f A = S u m o f M o les o f a ll co m p o n en ts Mass Mass Percentage (%), ppm , ppb m a ss o f so lu te % b y m a ss = ×100% m a ss o f so ln ppm: P a rt ( so lu te ) p a rts p er m illio n ( p p m ) = × 106 T o ta l ( s o lu t i o n ) ( u se th e sa m e u n it s fo r b o t h ) ppb: P a rt ( so lu te ) × 109 T o ta l ( s o lu t i o n ) ( u se th e sa m e u n it s fo r b o t h ) p a rts p er b illio n ( p p b ) = Concentration Units Molarity (M) m o les o f so lu te ( m o l ) M= lit er s o f so lu ti o n ( L ) Molality (m) m o les o f so lu te ( m o l ) m= M a s s o f so lven t ( kg ) Molarity Molarity (a) Calculate the molarity of 1.33 g KOH in 2.5L solution MKOH = (1.33 gKOH ÷ 56.1 g/mol) / 2.5 L = 0.0095 M (b) Calculate the grams of solute in 500 mL of 0.0119 M NaCl gNaCl=[0.0119 mol/L×(500 mL÷1000L/ml)]×58.5g/mol = 5.95 × 10-3 mole × 58.5 g/mol = 0.348 g NaCl Exercise: What is the molarity (M) of a 3.0% by mass H2O2 solution when its density is 1.05 g/mL. 3% = 3.0 g H...
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