20. In current-sampled polarography the polarographic wave of which metal ion will appear first? Pb (E% = -0.4 V) Cd (E% - -0.6 V) O Zn (E% = -1.0 V) Cu (E% - +0.02 V)
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- 3C Complete the figure below according to H, I and J. o Mg Br Note: Ignore stereo imaging in all cases. 1/₂ HO. B Br A I F + HCHON goNSU | Northeastern State Univ x * OWLV2 | Online teaching and lear X b My Questions | bartleby x + Content A east.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-take Chapter 6 Homework - EOC [References) Question 5 O 1 pt Given the following data C2H4 (9) + 302(g) → 2 CO2(9) + 2H20(1) 2C2 Hs (g) + 702 (9) → 4 CO2(g) + 6H2O(1) 2H2 (g) + O2 (9) → 2H2O(1) Question 6 1 pt AH= -1411.0 kJ AH=-3119.8 kJ Question 7 O 1 pt AH=-571.7 kJ Question 8 1 pt calculate A H for the reaction Question 9 O 1 pt C2H4 (9) + H2 (g) → C,H6 (g) Question 10 O 1 pt ΔΗ= kJ Question 11 O 1 pt Question 12 O 1 pt Submit Answer Try Another Version 2 item attempts remaining Question 13 1 pt Question 14 1 pt Question 15 1 pt Question 16 1 pt Question 17 1 pt Question 18 O 1 pt Question 19 1 pt Question 20 1 pt Progress: 12/20 items Due Mar 30 at (Previous Next 11:55 PM 9:36 PM P Type here to search Hi a 99+ G 1x ENG 20 3/29/2021R 400m N CO₂tBu OH CO₂Me Ph LDA THF, -78 °C silica gel 6 days room temperature R MeO₂C NCO₂Bu CHO CO,Me I + H₂O
- Lv2 1 On x S Write electre X uzdLQYhAS) X G Predict the t X Periodic Tab X b Answered: [ X 0 mySigTau X M (no subject) X Electronega x + gagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator=Dassignment-take OC [References] Consider the following reaction: H. H. Br Br C=C (g) + Br, (g) H-C-C-H (g) AH =-92 kJ H. H. H. H. Estimate the carbon-bromine bond energy given that the C-C bond energy is 347 kJ/mol, the C = C bond energy is 614 kJ/mol, and the Br- Br bond energy is 193 kJ/mol. DCBr kJ/mol %3Drofiles X Ave X 14 X nt/takeCovalentActivity.do?locator assignment-take 30 Tab Window Help Quiz 5.pdf F3 Submit Answer OWI X 54 $ R a [Review Topics] [References] Use the References to access important values if needed for this question. Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC, H4O4. This is often written in shorthand notation as KHP. What volume of a 0.182 M calcium hydroxide solution is needed to exactly neutralize 2.27 grams of KHP? Volume = mL F4 OCT 12 Para X % Math 122 Quiz 5.docx 5 Retry Entire Group tv T 9 F5 8 . We Show All 4) F12 1 X delete25.0 g of an impure sample containing cobalt was dissolved in acid and diluted to1000.00 mL. 6.00 mL of this sample was removed, treated appropriately to give a coloredsolution, and then diluted to 250.00 mL. This final solution had an absorbance of 0.410.Calculate the percentage of cobalt (MW = 58.93 g/mol) in the original sample.
- The absorbance of 10 mL of 0.0005 M Co2+ solution is 0.35. 10 mL of this solution mixed with 10 mL of the sample solution produces an absorption of 0.52. Calculate the concentration of Co2+ in the sampleg 2.png Average absorbance, .129 +0.128 +0.127)/3 = 0.128 Chrome Concentration of Females of Fe volume Q Molarity of Fe(NO₂)) = 0.2M Volume of Fe(NO₂)); = 5.00mL Moles of Fe³+= Molarity x Molarity x volume(L) Moles of Fe³* = 0.2M x 0.0054 = 10³mole 10-mole 500 x 10-3=0.002M [Fe³+] = [SCN¯] = X = ✪ [Fe³] = 0.002mol/L nknown concentrations to determine [FeSCN]at equilibrium in solution 8: Y = 4290X - 0.068 72% (0.127 + 0.068) 4290 0.127=4290X - 0.068 25ml Fe³+ x 0.002 mol/L-¹ 100mL 100% = 4.5 x 10-5mol/L 20ml SCN X 0.002 mol/L-¹ 100mL = 5.00 x 10^4 mol/L^-1 = 4.00 x 10 mol/L-1 W Flask 8 Flask 9 Flask 10 Flask 11 3.png 4.png Part 3: Q8 Flask 8 Flask 9 Flask 10 Flask 11 Part 3: 09 Flask 8 Flask 9 Flask 10 Flask 11 [Fe³+ (mol/L) 5.00 x 10-4 5.00 x 10-4 5.00 x 10-4 5.00 x 10-4 Average absorbance 0.127 0.166 0.222 69% 0.308 100% [FESCN¹ (mol/L) 4.5 x 10- 5.4 x 10 6.76 x 10-5 8.76 x 10- [SCN (mol/L) 4.00 x 10-4 4 x 10-4 7 x 10-4 1x 10-³ 3 7.png Place the results from calculations 9 and 10 into…A solution of FeSCN2+ has an absorbance of 0.237. What is its concentration? 0.19 M 0.47 M 0.24 M 0.80 M 0.65 M
- TScholarsh X = Report - X Grammar X ent/takeCovalentActivity.do?locator=assignment-take 2req = 2req =2req 5 SM M S s2req O ts 2req ts M (M) ots ots O NGLSync X OWLv2 | X Cengage X * 0 Use the References to access important values if needed for this question. What is the calculated value of the cell potential at 298 K for an electrochemical cell with the following reaction, when the H₂ pressure is 7.74x10-3 atm, the H+ concentration is 1.42M, and the Ni2+ concentration is 4.99 × 10-¹M? 2H+ (aq) + Ni(s) → H₂(g) + Ni²+ (aq) Ecell = V The cell reaction as written above is spontaneous for the concentrations given: Submit Answer Retry Entire Group 9 more group attempts remaining a #3 O C 73°F E 56 0 Update 1:43 PM 5/27/2022 Ę X7. Fill the absorbance value below; Path length 0.4 0.6 0.8 1.0 0. 0.2 25 12.5 6.25 3.125 % T 100 50 AbsorbanceCa(QCI)2 + 2 CH3COOH E-> 2HOCI + (CH3COO)2Ca|