Ammonium nitrate is one of the most important nitrogenous fertilizers. Its purity can be determined by reacting this ammonium nitrate with Ba(OH)2. During an experiment 0.4082 g fertilizer powder was just converted by adding 24.42 ml 0.1023 M Ba(OH)2 solution. How much % ammonium nitrate is in this fertilizer?

Please explain how the following two combustion (burning) reactions appear to disobey the law of conservation of Mass: a When a diamond is burned, the mass that remains is zero. B. When a piece of wood is burned, the leftover ashes weight less than the wood. Upon further investigation, it is noted that CO2 is vented off from both reactions. With this additional information, state how you can prove the diamond is made of pure carbon ans yet the wood is not.

Balance the following reactions and indicate which of the six types of chemical reaction are being represented. Assume that all reactions “take place.”    Remember: you want the simplest ratio of coefficients.

1)              ____ NaBr + ____ Ca(OH)₂ à ___ CaBr₂ + ____ NaOH

Type of reaction: _____________________________

2)              ____ NH₃+ ____ H₂SO₄ à ____ (NH₄)₂SO₄

Type of reaction: _____________________________

3)              ____ C₅H₉O + ____ O₂ à ____ CO₂ + ____ H₂O

Type of reaction: _____________________________

4)              ____ Pb + ____ H₃PO₄ à ____ H₂ + ____ Pb₃(PO₄)₂

Type of reaction: _____________________________

5)              ____ Li₃N + ____ NH₄NO₃ à ___ LiNO₃ + _____     Ammonium nitride (Write correct formula, balance)

                                 Type of reaction: _____________________________

6)              ____ HBr + ___ Al(OH)₃ à ___ H­₂O + _____            Aluminum bride (Write correct formula, balance)

Type of reaction: _____________________________

7)          ___ N₂H₄ +   ___ H₂O₂    à ___N₂ + _____ H₂O
                                                                                                                                   Type of reaction: _______________________

8)      ______P₄ +   _____O₂   à    ____               Diphosphorus trioxide      (Write correct formula, balance)    
                                                                                                           Type of reaction _________________________

9)     _____ Fe      +    ____O₂ -à   ________       Iron (III) oxide) (Write correct formula, balance)

Consider the following hypothetical reaction which could occur between a cyclic haloalkane and magnesium hydride: C10H14Cl6 + Mg2H4 → C10H22Cl2 + Mg2Cl4 calculate the atom economy of this reaction assuming that C10H22CL2 is the desired product

What are the effective buffering ranges of MOPS (3-(N-morpholino)propanesulfonic acid) and SHS (sodium hydrogen succinate)? The Nitrogen atom of MOPS can be protonated (pKa=7.2). The carboxyl group of SHS can be ionized (pKa=5.5).Calculate the ratio of basic to acidic species for each buffer at pH 6.5.

What is the Theoretical Yield of Caffeine Salicylate if we start with 50 mg of Caffeine and an excess of Salicylic Acid.

Determine the pH of a solution created by mixing 240mL of 0.172M HCHO2 with 275.2mL of 0.150M NaOH.

The answer key says the answer is 8.32, but I keep getting 8.18

The solubility (i.e. the maximum molarity at equilibrium) of N₂ gas in blood at 37^oC under a nitrogen partial pressure of 0.80 atm is 5.6 x 10^-4 mol.L^-1. When swimming at large depth in the ocean, a diver breathes compressed air with a partial pressure of N₂ equal to 4.0 atm. Henry’s law indicates that the solubility of N₂ gas increases with pressure. Assume that the total volume of blood in the body is 5.0 L. Calculate the amount of N₂ gas in the diver’s blood before diving. Calculate the amount of N₂ gas in the diver’s blood as he is breathing compressed air with a partial pressure of N₂ equal to 4.0 atm. Calculate the amount of nitrogen gas (in liters) that must be released when the diver returns to the surface of water, where the partial pressure of N₂ is 0.80 atm.

What are the drift speeds of Li+, Na+, and K+ in water when a potential difference of 10 V is applied across a 1.00 cm conductivity cell? How long would it take an ion to move from one electrode to the other? In conductivity measurements it is normal to use alternating current: what are the displacements of the ions in centimeters during a half cycle of 1.0 kHz applied potential.

The experiment is: analyzing food products for vitamin C. "Determine the amount of vitamin C (ascorbic acid) in different food products by oxidation- reduction titrimetry."

A student performed the experiment described in this module. She first standardized her DCP solution by preparing an ascorbic acid solution containing 46mg of reagent-grade ascorbic acid. Three 10.00mL samples of the ascorbic acid solution required an average of 25.7mL of titrant for the complete reaction.

1)calculate the mean molartity of the DCP solution.

The student titrated three 25-mL samples of a commercial orange "drink". These samples required an average of 14.2 mL of the DCP solution for a complete reaction.

2.) calculate the mass of ascorbic acid present in 25 mL of the orange drink

3.) calculate the number of milligrams of ascorbic acid present in 1 L of the orange drink.

Finally, the student used DCP titration to analyze the extract from the 4.00 g of fresh spinach. The titration required 23.2 mL of DCP solution

4) calculate the mass of ascorbic acid in 4.00 g of spinach assuming that all of the ascorbic acid in the spinach was contained in the extract

5.) which would supply more vitamin C a fresh spinach salad containing 100 g of spinach or a 4 oz glass of orange drink described above? one ounce equals approximately 30 mL

6.) would you expect the ascorbic acid content of spinach increase, descrease, or remain the same after the spinach has been steamed, prior to serving? briefly explain

Use the following data for water at 25 degrees C to answer this question. DeltaHfm(H2O)(l) = -285.830 kj/mol, DeltaHfm(H2O)(g) = -241.818 kJ/mol, DeltaGfm(H2O)(l) = -237.129kJ/mol, DeltaGfm(H2O)(g) = -228.572 kJ/mol

A) calculate the vapor pressure of water at 25 degrees celcius (hint: calculate the equilibrium constant for the "reaction" H2O(l) to H2O(g))
B) calculate the normal boiling point of water (pH2O)= 1 atm
C) why does the answer to part b differ from 100 degrees C, the correct normal boiling point of water?

Complete the following: ( NOTE: Formulas should be entered like the following example: potassium sulfate - K2SO4 , another example: zinc nitrate - Zn(NO3)2 )

Compound              Ionic or Covalent                  Formula

sodium oxide                                                

iron(III) bromide                                           

sodium carbonate                                          

carbon tetrachloride                                       

nitrogen tribromide                                        

Consider the titration of 50.00 mL of 0.200 M thioglycolic acid, H2SC2H2O2 (Ka1 = 2.3 x 10 -4 and Ka2 = 2.5 x 10 -11) with 0.500 M NaOH and calculate the pH after the following volumes of NaOH have been added. a) 0.00 mL b) 7.00 mL c) 20.00 mL d) 32.00 mL e) 40.00 mL f) 43.00 mL

1. Construct the titration curve, for the titration of 50.0 mL of 0.125 M trimethylamine with 0.175 M HCl (aq).

A. Calculate the initial pH of the solution in the flask.

B. Calculate the pH after 15 mL of titrant is added.

C. Calculate the pH at the equivalence volume.

D. Calculate the pH after 45 mL of titrant is added.

E. Calculate the pH after 60 mL of titrant is added.

Please make sure to include the titration curve and show your work!