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

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%)

5. Write explanation in ONE sentence only. a) H2Te > H2Se > H2S > H2O acid strength order b) A. CO2 B. CaO C. SO2 D. H2O E. NO2 only basic oxide or oxide that forms a base on dissolving in water. c) HPO42– < H2PO4– < H3PO4 acid strength order 6. Which of the following solutes would be expected to provide the most particles and to freeze at the lowest temperature? Explain in a maximum of 2-3 sentences. i) 0.10 mol HClO ii) 0.10 mol HClO3 iii) 0.10 mol HClO2 iv) 0.10 mol HClO4

acidic solution. SO n.

Calculate the PH and POH for a .023 mole solution of HBrO2   Ki for HBrO2 = 2.1 X 10-4

a. b. d. NH₂ ·승 *H120 OCH se OCH, 1. NaOCH3 2. H3O+ 1 LAIH 2. acad 1 LIAH 2 acid I LAIRI 2. acal 1. LAIH 2 acid I

1. Calculate the H30* and OH concentrations according to the given ph values Solution pH [H;O'] [OH] Woboiled distilled water 9.02 Boiled distilled water, 6.54 1.0 M NaCl solution 6.02 1.0 M NaHSO4 solution 0.73 1.0 M Na2CO3 solution 11.48 2. Calculate the Ka and Kb values for 1.0 M NaHSO4 and NazCOa. Hydrolysis Reaction Expression for Ku and K, Value of K and Solute NaHSO4 pH=0.73 NazCO3 pH= 11.48 NaHSO, H20 NaSO4 H3o* NazCO3 H20 NazCHO, + он

What are the products of a reaction between an acid and a base? O a Carbon dioxide and a salt O b Another acid and base Ос Water and a salt Od Either two acids or two bases

A sample of alfalfa meal weighing 2.0 g is analyzed by Kjeldahl method for the percentage of nitrogen. The liberated NH3 is caught in a solution of H3BO3, and 8.23 ml of HCl are required in the subsequent titration. A sample of pure (NH4)2SO4 (132.12) weighing 0.61 g is treated with excess NaOH and the liberated NH3 (17.04) is also caught in H3BO3. The resulting solution requires 20 ml of the acid for titration. Calculate the percentage of protein in the sample using 6.25 as the factor.

Arrange the following in increasing pOH. Select one: O a. III, II, IV, I O b. III, IV, II, I O C. I, II, IV, III O d. I, IV, II, III I E ||| NH₂ IV NH₂