Chemistry question and answers for July 18, 2023
- Q Estimate the pH of a 50 mM solution of acetic acid made up in0.1 M K2SO4?
- Q Refridgerant-134a with a flow rate of 0.12 kg/s is cooled to 40degrees C at constant pressure in a condenser by using coolingwater. Initially the refrigerant is at 1,200 kpa and...
- Q What technique can be used to monitor the compounds that arecollected from the column?
- Q Find the value of the equilibrium constant Kc at 460°C for thereaction-½ H2(g) + ½ I2(g)HI(g)given the following data: A 4.50-mol sample of HI is placed in a1.00-L vessel at...
- Q For the equilibrium: O2(g) + 2 F2(g)2 OF2(g) ; Kp = 2.3 x 10–15Which ONE of the following statements is true?A) If the reaction mixture initially contains only OF2(g), then...
- Q Calculate the pH of a .003 M solution of NaF, given that the Kaof HF = 6.8 x 10^-4 at 25 degrees celcius.
- Q How much 5.5 M NaOH must be added to 590 mL of a buffer that is0.0195M acetic acid and 0.0250M sodium acetate to raise the pH to5.75?
- Q A tanker truck carrying 2.01×103 kg ofconcentrated sulfuric acid solution tips over and spills its load.The sulfuric acid solution is 95.0% H2SO4 bymass and has a density of 1.84 g/mL....
- Q How do volume e mass influence ΔH e q?How does having waters of hydration affect the enthalpy fordissolving?
- Q Consider the equilibrium CH4(g) + H2O(g) <--> CO(g) +3H2(g), where delta h= 206 KJ. Which of the following disturbanceswill NOT cause the system to shift to the right to reestablishequilibrium?A.)...
- Q A student dilutes 50 mL of a phosphoric acid-dihydrogenphosphate buffer solution to a final volume of 100 ml.Will the pH of the buffer change noticeably? (Use Henderson-Hasselbeck conceptually )For the...
- Q copper (II) oxide reacts with hydrogen gas to produce copper andwater, what volume of H2 at 1.01 at and 225C is needed to reduce0.446 mol of copper (II) oxide ?
- Q How does one obtain an appropriate mixture of methanol and waterfor recrystallizing a solid sample?
- Q Write the balanced complete ionic equations and net ionicequations for the reactions that occur when each of the followingsolutions are mixed. (Type your answers using the format [NH4]+ forNH4+ or...
- Q The standard enthalpies of formation of PbS(s), SO2(g) andPbO(s) are -98.3, -296.8. and -217.3kj mol respectively.Calculate the reaction enthalpy for the roasting of PbS(s).PbS(s)+3O2(g)--->2SO2(g)+2PbO(s)
- Q A 0.140-mole quantity of NiCl2 is added to a liter of 1.20 M NH3solution. What is the concentration of Ni2 ions at equilibrium?Assume the formation constant* of Ni(NH3)62 is 5.5...
- Q Consider the balanced chemical reaction shown below.4 PH3(g) + 8 O2(g) 6 H2O(l) + 1 P4O10(s)In a certain experiment, 3.382 g of PH3(g) reacts with 8.377 gof O2(g).(a) Which is...
- Q Calculate the volume of 0.20 mol/L KH2PO4and the volume of 0.10 mol/L NaOH required to prepare 50.0 mL ofbuffer with a formal (or total) concentration ofH2PO4 of 0.020 mol/LÂ Â and a...
- Q aside from not being cooked sprouts and sprout seeds are tcsfoods because they have a
- Q Calculate the pH for each of the following cases in thetitration of 25.0 mL of 0.120 M pyridine, C5H5N(aq) with 0.120 MHBr(aq):a) before addition of any HBrb) after addition of...
- Q Aldol condensationCompare the Wittig reaction to the aldol condensation (youshould provide at least three similarities and threedifferences)
- Q Chemical Process Calculations (Chem Eng Question)Assume the combustion of Butane (C4H10) in air to becomplete.a) Use a degree-of-freedom analysis to prove that if theprecentage excess air and the percentage conversion...
- Q Calculate the predicted pH of a .1M Solution of each of thefollowingCH2ClCOOH with Ka=1.4x10-3NaHSO4 with Ka = 1.2 x 10-2
- Q pK of the side chains of glutamate and lysine is 4.25, and10.53, respectively. Circle the answer: A protein containing 3glutamate residues and 4 lysine residues is (negatively,positively) charged at neutral...
- Q Proteins can move laterally in biomembranes and the lateraldistance (r) traveled in a given time (t) is given by, Thediffusion constant for (D) for the membrane protein fibronectin isapproximately 0.7...
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