# Henrys law&nbsp Sgas=kH Pgaslarge kh values produce large solu

Henrys law  Sgas=kH Pgaslarge kh values produce large solubility valueswhich of the following solutes should have largest henrys law constant inwater1.  Ar2.  Xe3.  CO4.  CH3CH35.  CO2My guess CO=============================If a reaction is known to be first order in reatactant A and third order inreactant BBy what factor will the rate change if the concentration of a is triples andconcentration of b is doubled1.  4xfaster2.  6x faster3.  7x faster4.  24x faster5.  48xfasterMy workK[A]1[B]3K  3[A]1  2[B]33^1(2^3)k[A]1[B]­­324x faster===========================Which of the following molecules would be the least soluble in water1.  Ch3ch2ch2ch2ch2ch2oh2.  Ch3ch2ch2ch2ch2oh3.  Ch3ch2ch2ch2oh4.  Ch3ch2ch2oh5.  Ch3ch2cohThe longer the carbon chain, the more greasy the molecule, the less watersoluble. Ch3ch2ch2ch2ch2ch2oh======================================Choose the situation below would result in an endothermic h solution1.  When |ΔHlattice| > |ΔHhydration|s2.  When |ΔHlattice| = |ΔHhydration|s3.  When |ΔHlattice| < |ΔHhydration|s4.  When |ΔHsolvent| >> |ΔHsolute|s·  I chose #2===========================Reaction rate constant for a particular second order reaction is .55M-1s-1if the initial concentration of reactant is .6 M how many seconds will ittake for the concentration to decrease to .1M1.  2.5s2.  15.2s3.  32s4.  1.75s5.  11.8smy workk=.55Ms[a]0=.6[a]t=.1(1/.1)-(1/.6)=.55tT=15.1515.2 [1/(A)] – [1/(Ao)] = kt==============================================What is Mass % solute of a 1.74 molal h2so4 solution in water1.  1.1%2.  10.2%3.  16.4%4.  14.6%5.  19.6%My guessworkmoles H2SO4 = 1.74mass H2SO4 = 2.00 mol x 98.078 g/mol=170.69 g mass water = 1 Kg = 1000 g 1000+170mass solution = 1170.7 g % = 170.7 x 100/ 1170.7=14.58=========================================Which of the following ions should have the least exothermic delta hhydration1.  Na+2.  Mg2+3.  Al3+4.  Ca2+5.  Sr2+Ion with largest charge should have the most exothermic enthalpy ofhydrationLeast Na=====================================Pu-239 radioactively decays via a first order process of 24200 yearsIf you started with a 5kg sample, how long would it take for 4.688kg todecay1.  24200 years2.  48400 years3.  72600 years4.  96800 yearsGuessed #2====================================The specific rate constant, k, for a reaction is 2.64×10^-2 s^-1 at 25degrees C, and the activation energy is 74.0 kJ/mol. Calculate k at 75 degreesC.1.  .932 s^-12.  83.9s^-13.  .266s^-14.  2.43s^-15.  1.92s^-1My work, I really don’t know if I did this right….T1 = 25 + 273 = 298 K T2 = 75 + 273 = 348 K ln(k1/k2) = (Ea/R) (1/T2 – 1/T1))ln (k/2.64 x 10^-2 ) = (74000 / 8.3145) ( (1 / 298 )- (1 / 348) )ln( k/2.64 x 10^-2 )= 4.29e ^ 4.29 = 72.9664k/2.64 x 10^-2 = 72.9664 K=1.92=======================================N2(g)+3H2(g)=2NH3(g)If h2 disappears at a rate of .1 M/s then NH3 appears at a rate of……1.  .067 M/s2.  .15M/s3.  .033 M/s4.  .3 M/s5.  .1 M/sGuessed .067==============================================Which of the following reactions would you predict to have the largestorientation factor?1  NH3 (g) + BCl3 (g) ->  H3N-BCl3 (g)2  H (g) + Cl (g) ->  HCl (g)3  NOF (g) + NOF (g)  ->  2NO (g) + F2 (g)4  Br2 (g) + H2C=CH2 (g) ->  H2BrC-CBrH 2 (g)5  All of these reactions should have nearly identical orientationfactors.My guess #2==================================================What is the vapor pressure of aqueous solution containing 10% ethyleneglycol (62.067g/mol) at 25 cPH2O=23.5 torr at 25 C1.  25.1torr2.  21.9torr3.  23.5torr4.  18.9torr5.  .761 torrMy guessworkMass ethylene glycol = 10 g moles = 10/ 62 = 0.161 mass water = 90 g moles = 90 / 18 = 5 mole fraction water = 5 / 5 + 0.161 =0.969 p = 24.3 x 0.969 = 23.5 torr======================================================If the concentration of CO2 is 2.90 g of CO2 per 1.00 L of softdrink when bottled under 2.0 atm of CO2 pressure, what will be theconcentration of the CO2 in the drink after it has been opened andleft to come to equilibrium with the atmosphere which has a CO2partial pressure of 3.0 x 10-4 atm? a) 2.2 x 10-3 g CO2/Lb) 2.0 x 10-4 g CO2/Lc) 1.0 x 10-4 g CO2/Ld) 4.4 x 10-4 g CO2/Le) 4.6 x 10-2 g CO2/LI guessed d, I have no idea….================================================Which of the following statements about catalysts are false?1  A catalyst lowers the reactions delta h.2  A catalyst speeds up the rate of the reaction3  A catalyst cannot make a nonspontaneous reaction spontaneous.4  A catalyst increases the rate of both the forward and reverse reaction.I guessed 3, no clue=======================================================2h2s+3o2=2so2+2h2oRate law =k[h2s]^2[o2]^2What is overall order of reaction?1234I put 42+2=4

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