When 10.0 mL of 1.00 M AgNO3 solution is added to 10.0 mL of 1.00 M NaCl solution at 25.0 ° C in a calorimeter, a white precipitate of AgCl forms and the temperature of the aqueous mixture increases to 32.6 ° C. Assuming that the specific heat of the aqueous mixture is 4.18 J/(g °C), the density of the mixture is 1.00 g/mL, and the calorimeter itself absorbs a negligible amount of heat, what is ΔH in kJ/mol AgCl for this reaction?

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For the reaction 3NO2(g)+H2O(l)→2HNO3(aq)+NO(g),
What is the mass of HNO3 that is produced when 24.45 g of NO2 and 24.45 g of H2O react

A buffer is prepared by adding 108 mL of 0.48 M NH3 to 143 mL of 0.30 M NH4NO3. What is the pH of the final solution?

What are the requirements for good crystalization/precipitation?

Look up the Osmotic Pressure in your blood and discuss why sea water will kill you if you drink it. (I know that it is more to do with kidneys than blood… but that is too much biology for this worksheet.)

Describe and explain the possible effect on your TLC results of the following experimental errors or variations:

a) The analyte spots are too large

(b) The analyte solution is too dilute.

A piece of titanium metal was anodized for 30.0 minutes, producing 10.0 g of TiO2. What current was used?

1.Why would it be important to place the same amount of a solution in the polarimeter tube when measuring optical rotation as the amount of solvent when measuring theblank?

a. Only a certain volume of liquid can be placed in a polarimeter tube.

b.So the path length can be easily converted to mL\'s when calculating optical rotation.

c. So the density of the blank can be added to that of the solution when calculating optical rotation.

d. None of the answers shown are correct.

e. Biots law, used to calculate optical rotation, requires that the volume of the blank be subtracted from that of the solution to arrive at a proper density value.

2. The optical rotation of a sample composed of only L-alanine is determined to be [α]obs = 0.33°. If the cell path length was 1.2 dm and the concentration of L-alanine in the sample was 1.3 g/ml what is the specific observed rotation?

3. A mixture of equal amounts of two enantiomers ___________

a. optically active

b.its called a racemic mixture

c. implies that enantiomers are meso form

d. racemic optically active

e. all answers are incorrect

4. Suppose a student is measuring the optical rotation of a 0.541 M pure sample of (S)-(–)-limonene. The path length is 6.51 cm. What optical rotation should the student expect to measure? (S-(–)-limonene [α]D = –122.1°)

Shown below are the 4 reactions involved in the Cu cycle listed in random order.

a.Cu(PO)(s) + 6HCl(aq) → CuCl(aq) + 2HPO(aq) 


b.CuCl(aq) + Mg(s) → MgCl(aq) + Cu(s) 


c.Cu(s) + 4HNO(aq) → Cu(NO)(aq) + 2NO(g) + 2HO(l) 


d.3Cu(NO)(aq) + 2NaPO(aq) → Cu(PO)(s) + 6NaNO(aq) 


Is the order C, D, A, B?

The first reaction in the cycle is initiated by adding 6 M nitric acid to elemental copper.

1) Calculate the volume of 6 M HNO3 needed to react with 0.636 grams of Cu.

a) Convert grams Cu to moles Cu 


                                    0.636gCu X (1molCu/63.546gCu)= 0.010mol Cu

b) Calculate the moles HNOneeded for the amount of Cu in part (a) using the balanced chemical equation. 


                                    0.010mol Cu X (4 mol HNO3/ 1mol Cu)= 0.040mol HNO3

c) Calculate the volume of 6 M HNOneeded to provide the moles of HNOin part      (b). 


                                    (0.040 mol HNO3/6M)= 0.007 L

2) Calculate the yield in moles of the copper (II) nitrate that you expect to obtain from 0.636 grams of copper. 


I already calculated the moles of Cu present in 0.636 grams of Cu (calculation 1).

0.010mol Cu X (1mol Cu (No3)2/ 1molCu) = 0.010mol (CuNo3)2

I’m not sure how to start the following problems:

It is now time to calculate the amount of the next reagent needed for the 2nd reaction in the cycle involving copper nitrate.

The following reagents are available to carry out the rest of the reactions in the copper cycle.

elemental magnesium


6 M hydrochloric acid

0.5 M sodium phosphate

3) For the second reaction in the cycle, use the moles of copper (II) nitrate expected at the end of the first reaction in the cycle as the starting point for the next calculation.

a) calculate the volume in mL or the mass in grams of the appropriate reagent needed for the next reaction in the cycle. 


b) calculate the yield in moles of the copper product produced by the 2reaction.

2) Repeat the calculation for the next reaction in the cycle until you have calculated the 
amounts of all reagents needed for each reaction in the entire copper cycle. 


Be sure you are explicit in your calculations and include all formulas and units. Be sure that you use the expected yield of copper product from one reaction as the starting amount of copper reactant for the calculation for the next reaction in the cycle.

3) For the final reaction in the cycle,

a) Calculate the yield in grams of solid copper that should be obtained.

Write a formula to express the yield of copper in grams at the end of the copper cycle as a percentage of the mass of Cu started with in the reaction between Cu and HNO3.

A 3.10 g sample of methane, CH4, is combusted in a calorimeter. The calorimeter and water combined have a heat capacity of 42.30 kJ/K. The observed temperature rise is 4.05 °C. Calculate the heat of combustion of methane in kJ/mol. The products of the reaction are water and carbon dioxide.

1.how are water moeclues pulled into the sodium polyacrylate polymer?

2.What types of compounds might disrupt the water molecules from the sodium polyacrylate polymer? Why do you think this?

A 20.8 mL sample of 0.304 M triethylamine, (C2H5)3N, is titrated with 0.341 M hydroiodic acid.

(1) Before the addition of any hydroiodic acid, the pH is (2) After adding 7.53 mL of hydroiodic acid, the pH is

(3) At the titration midpoint, the pH is

(4) At the equivalence point, the pH is

(5) After adding 26.5 mL of hydroiodic acid, the pH is

Please show step by step instructions,

many thanks!

Explain the mass fragmentation pattern of (organic spectroscopy)
1) Benzene
2)Neopentane
3)n-butyl alcohol
4) Toluene
5)1-Butanol
6)Benzyl alcohol

Write the balance net ionic equation for:

Reaction of V(OH)3 (s) with oxygen in basic solution to produce the final form listed above