Give the solution with proper sig figs.  4.523 g O2  x  ( 1 mol O2 / 32.00 g O2)  x  (– 533.7 kJ/ 3 mol O2)  =  – 25.14505313 kJ   a. – 25.145 kJ b. – 25.14505313 kJ c. – 25 kJ d. – 25.1 kJ e. none of these f. – 25.15 kJ g. – 2 x 10^1 kJ h. – 3 x 10^1 kJ i. – 25.14 kJ

Provide detailed solution and explanation

One mL of an unknown solution is placed in a test tube and a few drops of NaOH are added and shaken well. 1 mL of aqueous NH3 is then added to the solution and shaken again. A deep blue solution is observed. What is the interpretation for this result? Select one: A. There is Iron(III) (Fe3+) present in the solution. B. There is Zinc (Zn2+) present in the solution. C. There is Copper(II) (Cu2+) present in the solution.

2. Using the procedure described in this module, a student determined the percent KHP in an impure sample of KHP. A 3.150-g sample of impure KHP required 41.50 mL of 0.1352M NaOH solution for titration. (a) Calculate the number of moles of NaOH required for the titration. (b) Calculate the number of moles of KHP present in the impure sample of KHP. (c) Calculate the number of grams of KHP present in the impure sample. (d) Calculate the percent of KHP in the impure sample, using Equation 8. Equation 8: percent KHP in the impure sample, % = ( mass of KHP in the sample,g/ mass of sample analyzed, g) (100%)