o a total volume of 18.0 mL. What is the molar concentration of Cu in the dillut
ID: 102943 • Letter: O
Question
o a total volume of 18.0 mL. What is the molar concentration of Cu in the dilluted solution? 7.0 mL of a 0.45 M Cu2+ solution was diluted with H20 t Cu2+ molarity Submit Answer Tries 0/2 2. A Beer's law plot for Cu2 was experimentally obtained. Which graph represents a correct Beer's law plot? Conc Conc Conc Conc Submit Answe Tries 0/2 -intercett-0.001). A Cu2+ solution of unknown concentration had an for Cu?+ was experimentally obtained. The slope of the Beer's law plot was 435 /mol (with a y 3. A Beers law plot absorbance of 0.95. What is the molar concentration of Cu2+ in the unknown solution? Cu2+ molarity Submit Answer Tries 0/2 Use these 2 reactions to answer Question 4: of a Cu2+ solution of unknown concentration was placed in a 250 mL Erienmeyer flask. An excess of KI solution was added. Indicator was added and the M Na S203- The equivalence point of the titration was reached when 11.30 mL of diluted with H20 to a total volume of 75 mL. For rxn 2, the solution from rxn 1 was titrated with 0.10 Na250 had been added. What is the molar concentration of Cu2+ in the unknown solution?Explanation / Answer
9. answer: Yes. CH2-NH2 invloves in H-bonding.so that it is stabilised.
10. heat released(q) = m*cP*dT
= 248.5*4.184*(57.6-20)
= 39.1 kj
11. DHrxn = -q/n
DHrxn = -6.105/0.55 = -11.1 kj/mol
as heat is released, it is exothermic.
12. from the given data
E + 2B ---> C + F DH1 = 244 Kj
F + G ----> D DH2 = 40 Kj
C + D -----> A + 2B DH3 = -192 Kj
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E + G ----> A DH = DH1+DH2+DH3
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DH = 244+40-192 = +92 Kj
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