What is the percent yield of a reaction if the product recovered is 89.4 g and the theoretical yield is 128.4 g?

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Write and balance the molecular equation for the complete neutralization of H3PO4 by KOH What is the molar ratio of acid to base (stoichiometric factor)?

Calculate the number of moles of AgNO3 (MM=169.87 g/mol) in 150.0mL of 0.200 M solution

Consider the titration process according to the reaction below Sr(OH)2(aq) + 2HCl(aq) => SrCl2(aq) + 2H2O(l) What is pH at the equivalence point?

8.00 ml of 0.50 M HCl reacts with 8.00 mL of 0.50 M Ba(OH)2 in a stoichiometry study using the methods of continuous variations. The stoichiometry of the system was shown by the following balanced equation: Ca(OH)2(aq) + 2HCl(aq) → CaCl2(aq) + 2H2O(l) On the basis of the limiting reagent, calculate the theoretical number of moles of product (BaBr2) that should have been formed.

Calculate the mass percent of Cu(NO3)2  (MM=187.56 g/mol) in a 0.750M solution. d=1.20g/mL

How many grams of AgNO3 (MM=169.87 g/mol) were used to prepare 250. mL of a solution that is 0.140M?  

What is the molarity of a solution formed by dissolving 9.77 g LiBr (MM=86.845 g/mol) in enough water to yield 1500.0 mL of solution?     

1. The following table was filled by the student during the measuring of the absorbance of a 100 mM solution of Ni2+ ion. Wavelength Absorbed (nm) Color Absorbed Color Observed Absorbance of solution 410 Violet Yellow-Green 0.23 430 Blue-Violet Yellow 0.52 480 Blue Orange 0.07 500 Blue-Green Red 0.03 530 Green Purple 0.01 560 Yellow-Green Violet 0.01 580 Yellow Blue-Violet 0.01 610 Orange Blue 0.03 680 Red Blue-Green 0.16 720 Red-Purple Green 0.19 Select a correct wavelength to measure the absorbance of nickel-containing solutions and justify your answer (4pts):           2. The following calibration table was built in order to calibrate the colorimeter: Test tube # Concentration of Ni2+ ions, M Absorbance Blank 0.000 0.00 Test tube 1 0.020 0.12 Test tube 2 0.040 0.20 Test tube 3 0.060 0.34 Test tube 4 0.080 0.44 Test tube 5 0.100 0.51 Test tube 6 0.120 0.62 Test tube 7 0.140 0.70 Test tube 8 0.160 0.80 Test tube 9 0.180 0.96 Test tube 10 0.200 1.10 Report the equation of the trendline in terms of Absorbance, Molarity and molar absorptivity (you do not need to show the graph) and the value of R2(6pts, report your answer):   3. The 15.0 g sample of Zn-Ni alloy was dissolved in the nitric acid and diluted to 250.0 mL. The measured absorbance of the solution was 0.75. Use the calibration curve equation to calculate and report:Molarity of the solution (3 pts, report your answer): %Ni in the alloy (3 pts, report your answer): Show work for Credit: take a picture of your work, save it to your Canvas files, and upload your answer in the Work and Calculations assignment provided.