2CH₄ + 4Cl₂ = 2CHCL₃ + 2HCL

1) If 5.5 CH₄ react with 27.4 g CL₂ what is the limiting reactant and what mass of HCl will form? (I can find the LR but I have problems with finding the mass of HCL)

2) If for the above reaction, the theoretical yield of CH₃Cl is 7.2g and the actual yield of HCl is 3.2 g, what is the percent yield?

Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N2O4 and 45.0 g N2H4. Some possibly useful molar masses are as follows: N2O4 = 92.02 g/mol, N2H4 = 32.05 g/mol.

            N2O4(l) + 2 N2H4(l) → 3 N2(g) + 4 H2O(g)

1. A fossil is found to have a 14C level of 87.0% compared to living organisms. How old is the fossil?

(answer in years)

2.Iodine-131 is a radioactive isotope. After 3.00 days, 77.2% of a sample of 131I remains. What is the half-life of 131I?

(answer in days)

1) Build models for the PH₃ and PH₄⁺ species.

How do you compare the angles of H - P - H bonds in both species? If different, explain why.

How do you compare your electronic and molecular geometries?

2 )Build the models for the PH₃ and H₂S species.

How do you compare the binding angles in both species? If they are different, explain why.

How do you compare your electronic and molecular geometries?

17.27 Briefly describe the two techniques that are used for galvanic protection.

In this experiment, benzyl and dibenzyl ketone will produce tetraphenylcyclopentadienone via aldol condensation reaction.

1.) What is a condensation reaction? What is the small molecule lost in this reaction?

2.) In this reaction, all the reactants are ketone compounds. Can condensation reactions be extended to other carbonyl compounds than ketones?

3.) What is an enol? In a tautomerization equilibrium, will the enol or the keto isomer will be favored?

4.) What is the driving force for the enolization? (what causes the enolate ion to be formed?)

5.) The reaction goes through color change. Why the color change happens in this reaction and how can this information is associated with the (predicted) success of this reaction?

6.) Side Products Possibilities:. Assume that and enolized molecule of dibenzyl ketone attacks another dibenzyl ketone. Write the overall chemical reaction.

1a. When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter.
In the laboratory a general chemistry student finds that when 1.33 g of CaBr₂(s) are dissolved in 103.70 g of water, the temperature of the solution increases from 24.23 to 25.85 °C.
Based on the student's observation, calculate the enthalpy of dissolution of CaBr₂(s) in kJ/mol.
Assume the specific heat of the solution is equal to the specific heat of water.
ΔH_dissolution =  kJ/mol

1b. In the laboratory a general chemistry student finds that when 21.18 g of Cs₂SO₄(s) are dissolved in 112.90 g of water, the temperature of the solution drops from 24.64 to 21.92 °C.
Based on the student's observation, calculate the enthalpy of dissolution of Cs₂SO₄(s) in kJ/mol.
Assume the specific heat of the solution is equal to the specific heat of water.
ΔH_dissolution =  kJ/mol

This is all the information the question gives me.

how do adhesion and cohesion explain capillary action?

how does water dissolve a substance like NaCl? Draw a picture illustrating this

Choose one answer

A 400 mOsm/1 glucose solution is:

A) Hyposmotic to a 200 mM solution of KCl

B) isosmotic to a 600 mM solution of KCl

C) Isosmotic to a 0.18% solution of KCl

D) Hyperosmotic to a 200 mM solution of KCl

E) isomotic to a 200 mM solution of KCl.

Consider the reaction: NO₂ (g) + CO (g) ---> CO₂ (g) + NO (g)

The equilibrium constant is at 701 K and 895 K are 2.57 and 567 L mol^-1 s^-1 so,

A. Find the reaction order

B. Energy of Activation

C. Use part b to find the reaction rate constant at 200 ^C

Name the possible products of this reaction in the presence of ether and AlCl3: methylbenzene + 2-chlorobutane.
1. 1-ethyl-2-methylbenzene

2. 1-ethyl-3-methylbenzene

3. 1-ethyl-4-methylbenzene

What is the pH of a buffer solution that contains 0.350M pyruvic acid and 0.150M sodium pyruvate? Ka = 4.1x10^-3

Select one:

A. 4.72

B. 2.82

C. 2.02

D. 2.76

What is the pH of a 100.0mL buffer solution that contains 0.215M acetic acid and 0.255M sodium acetate after 0.055 mmol HCl is added. Assume no volume change. Ka = 1.8x10^-5.

Select one:

A. 4.61

B. 4.87

C. 5.03

D. 5.48

Calculate the change in pH after 0.010 mole HCl is added of 1L of pure water at 25 degrees Celsius? Assume no volume change.

Select one:

A. 7

B. 2

C. 5

D. 9

Calculate the change in pH of a buffer solution that originally contains 0.0500M ammonia and 0.0500M ammonium after 0.020 moles of NaOH is added to 1.0L. Assume no volume change. Kb = 1.8x10^-5 for ammonia. Hint you need pKa.

Select one:

A. 0.63

B. 0.18

C. 0.55

D. 0.37

NaHCO₃ + HCl reaction

a)From the P,V,T data calculate the ACTUAL moles of CO₂ produced in each trial

b) With your result from part a, calculate the molar mass of CO₂ for each trial.

I think I'm using the wrong pressure in my calculations when I try it. I'm not sure :(