Based on your observations following the addition of (a) Fe(NO₃)₃, (b) NH₄SCH, (c) SnCl₂, (d) AgNO₃, (e) Na₂HPO₄, and (f) NH₃, which way did each of these reagents causethe equilibrium to shift? Considering Le Chatelier's Principle, provide a chemical explanation for the direction of the shift in each case.

How to calculate the weight percent Na2CO3 in impure base sample???

I did my calculations but it somehow doesnt make sense

First we find the moles of HCl

=0.1M HCl x volume of HCl used to titrate

       =0.1M x 10.5mL HCl

       =1.05 mol HCl

The ratio between Na2CO3 and Hcl is 1:2

Moles Na2CO3

= moles of HCl/2

=1.05mol HCl/2

=0.525mol Na2CO3

Mass Na2CO3

= moles of Na2CO3 x 105.9906 g/mol

       =0.525 mol Na2CO3 x 105.9906 g/mol

       =55.65 g

%    = mass of Na2CO3 x100/mass of sample from the impure solid

       =55.65g x 100/ 0.1328g = 41905.1205 ???

What did I do wrong??? (do I need to include the fact that that the impure base was first mixed with 25 mL of distilled water??? The HCl used is 0.1M for titrate to its endpoint)

1) A power plant with an efficiency of 65% combusts 500,000 metric tons (MT) of anthracite coal per year to generate electricity. It has been established that this type of coal has the capacity to generate electrical energy at 19 GJ/MT.

a) How much energy in GJ (giga joules) does this plant generate in one year?

b) Estimate the annual emissions of criteria pollutants including SO2, NOx, PM and greenhouse gases including CO2 and CO using the appropriate emission factors given in the below table.

2) The Power Company has recommended a plant conversation to switch to using natural gas as fuel to generate the same amount of energy. Your firm has been asked to review the economics and perform and sensitivity analysis for the proposed switch and make a recommendation to the regional Utility Board of Directions. If the natural gas to be used has an energy capacity of 43 MJ/m³ (mega joules per cubic meter of gas)

a) Estimate the volume of natural gas needed in m³/yr.

b) Calculate the annual emissions of criteria pollutants including SO2, NOx, PM and greenhouse gases including CO2 and CO using the appropriate emissions factors given in the below table.

3) The NG plant conversion is estimated to cost $25 million. Given that the cost of Anthracite coal is $750/MT and natural gas is $15/m³ calculate the plant operating costs per year and the annual fuel cost difference for switching to natural gas. Additionally, it has been determined that the cap and trade program for SO2 reduction will provide a credit benefit for $150/MT-SO2 reduced. Also, the plant is looking ahead and planning for the implementation of a similar cap and trade program similar to the European model for CO2 emissions. The expected credit benefit for CO2 emission reduction will be market based and can range from $100 to $300/MT-CO2 reduced. Determine the NPV, payout and rate of return for the plant conversion project incorporating the capital an operating costs and emissions program credit for SO2 with a 4% interest rate. If the carbon cap and trade system is implemented, how does that change the economic outcomes?

Based on the emission estimates and costs and benefits, what is your recommendation to the utility board?

(a) A mixture containing 2.15 g each of CH₄(g), C₂H₄(g) and C₄H₁₀(g) is contained in a 1.50 L flask at a temperature of 25°C.

Calculate the partial pressure of each of the gases in the mixture.

Calculate the total pressure of the mixture.
___ atm

(b) A mixture of gases contains 1.06 g of N₂, 2.22 g of H₂, and 1.22 g of NH₃. If the total pressure of the mixture is 4.12 atm, what is the partial pressure of each component?

Consider the titration of the weak acid HA with NaOH. At what fraction of Ve does pH = pKa -1? At what fraction of Ve does pH = pKa +1? Use these two points, plus Vb = 0, 1/2Ve, Ve, and 1.2Ve to sketch the titration curve for the reaction of 100 mL of 0.100M anilinium bromide ("aminobenzene x HBr") with 0.100M NaOH.

You are removing imidazole from your pooled nickel column samples by dialysis. The
volume of the pooled sample is 32 mL and the imidazole concentration is 0.5 M.

a. What is the concentration of imidazole after exposure to three consecutive dialyses
against 1 L of buffer?
b. If the imidazole at the start is 3.4% (w/v), what is the concentration in
weight percent at the end of the dialysis (three consecutive exposures to one liter
of buffer)?

Predict the effect on each of the following if the product was not completely dried after the recrystallization:
(a) percent yield; (b) melting point; (c) IR spectrum.

importance of discussion in study

Using 1.0 nM enzyme X for the enzyme kinetics experiments, you obtained the reaction rates at different concentrations of substrate (shown in the following table). Assume that the enzyme X follows a typical Michaelis-Menten kinetics.

[substrate] (μM) Reaction rate (μmol/s)

2 7

5 17

10 29

20 44

50 67

100 80

200 89

500 95

1000 98

a) Estimate the Vmax and Km values of the enzyme X in this reaction using the double reciprocal plot.

b) If 5.0 nM of the enzyme X is used in the experiment, what will be the Vmax and Km values of the enzyme X?

Rank the following from highest to lowest boiling point

1. 0.18 m NH4CH3COO

2. 0.14 m Cr(CH3COO)2

3. 0.13 m CuBr2

4. 0.45 m Urea(nonelectrolyte)

Absorbance at 540 nm of Bromocresol Purple Dilution Series

1. The point 0/0 is an important and valid point on this graph. Why? (Explain)  Explain how a hand-drawn graph and excel graph are similar or different.

2. How is the Beer’s Law equation similar to that of a straight line? Explain each component using the letter of the component and using a set of your experimental values. BCP: 0.015M

3. Evaluate your data using the Beer’s Law equation: use the absorbance reading for the highest concentration of a solution, determine the extinction coefficient for the BCP solution you were given. Do you get the same answer if you make this calculation at another concentration?

4. Select 2 random absorbance readings on your line (that you did not actually measure) and explain two different ways you can use your graph to determine the concentration of BCP (µg/mL) of the unknown solutions that might have the selected absorbance values.  ***Provide the results; what values do you determine to be the concentrations of your 2 random absorbance readings?

5. Explain why we refer to a graph such as the one you just constructed as a “standard      curve” or a “calibration curve.” How would a graph such as this one be useful?

Methane is burning with minimum amount of air to form the stable products. The premixed methane-air mixture is filled in a leak-proof spherical vessel at an initial pressure of 1 bar and 298 K. The vessel is well insulated to avoid thermal energy interaction with the surroundings.The combustible mixture is ignited at the centre of the vessel using an electrical spark. The energy added to the mixture for ignition is negligible. During the combustion process, the pressure of the combustion chamber increased due to the energy released by the fuel. Estimate the peak pressure that is achieved inside the vessel at the end of complete combustion without any dissociation of products. Both the reactants and products are in gas phase.

PleaseI need the procedure on how to solve this questions!

Thanks!

Consider the reaction at 298 K
SO2(g) + 2H2S(g) ? 3S(s) + 2H2O (g)

The ?G

A gas mixture with a total pressure of 770 mmHg contains each of the following gases at the indicated partial pressures: 133 mmHg CO2, 233 mmHg Ar, and 183 mmHg O2. The mixture also contains helium gas.What is the partial pressure of the helium gas?