The compound acrylonitrile can be made in the following reaction: 2C3H6(g) + 2NH3(g) + 3O2(g) → 2C3H3N(g) + 6H2O(g) A 250.0 L reaction vessel is charged to the following partial pressures at 500°C: PC3H6 = 10.0 atm PNH3 = 12.0 atm PO2 = 9.0 atm

A) What is the total pressure in the vessel just after the reagent gases are added (assume ideal behavior)?  

B) What are the mole ratios of the reagent gases in the vessel before the reaction begins?

C)What is the total pressure in the chamber after the reaction has gone to completion (i.e. all

of at least one of the reactants is used up)?

D) What is the partial pressure of acrylonitrile in the vessel after the reaction has gone to

completion?

E) What mass of acrylonitrile is produced after the reaction has gone to completion?

Consider a weak base-strong acid titration in which 25 mL of 0.160 M ammonia is titrated with 0.160 M HCl.

a) What is the pH of the ammonia solution before the addition of HCl? pKb of ammonia= 4.75

b) Calculate the pH after the addtion of 3 mL of HCl.

c) Calculate the pH after the addition of 12.5mL of HCl. This is the half-neutralization point: the partial neutralization of ammonia converts some of the NH3 molecules to NH4+ ions and produces a buffer whose pH depends on the acid/base ratio (NH4+/NH3).

d)Calculate the pH after the addition of 25mL of HCl (equivalence point).

e) Calculate the pH after the addition of 35mL of HCl.

f) Suggest an indicator, other then methyl red, that would be suitable for this titration, and explain why it would be effective.

Thanks alot

A computer system administrator notices that computers running a particular operating system seem to freeze up more often as the installation of the operating system ages. She measures the time (in minutes) before freeze-up for seven computers one month after installation, and for nine computers seven months after installation. The results are as follows: One month after install: 207.4 233.1 215.9 235.1 225.6 244.4 245.3 Seven months after install: 84.3 53.2 127.3 201.3 174.2 246.2 149.4 156.4 102.3 Let μX represent the population mean for the first month and let μY represent the population mean for the seventh month. Find a 95% confidence interval for the difference μX−μY . Round down the degrees of freedom to the nearest integer and round the answers to three decimal places.

Calculate the pH for each case in the titration of 50.0 mL of 0.200 M HClO(aq)0.200 M HClO(aq) with 0.200 M KOH(aq).0.200 M KOH(aq). Use the ionization constant for HClO.HClO.

What is the pH before addition of any KOH?KOH?

pH=pH=

What is the pH after addition of 25.0 mL KOH?25.0 mL KOH?

pH=pH=

What is the pH after addition of 35.0 mL KOH?35.0 mL KOH?

pH=pH=

What is the pH after addition of 50.0 mL KOH?50.0 mL KOH?

pH=pH=

What is the pH after addition of 60.0 mL KOH?60.0 mL KOH?

pH=pH=

https://sites.google.com/site/chempendix/ionization

A bomb at rest at the origin of an xy-coordinate system explodes into three pieces. Just after the explosion, one piece, of mass 4 kg, moves with a velocity of 45 m/s in the negative x-direction, and a second piece, also of mass 4 kg, moves with a velocity of 36 m/s in the negative y-direction. The third piece has a mass of 7 kg.

What is the initial momentum of the bomb before the explosion?

What is the x-component of the velocity of the third piece just after the explosion?

What is the y-component of the velocity of the third piece just after the explosion?

What is the magnitude of the velocity of the third piece?

Just after the explosion, in what direction is the third piece moving? (Give your answer as an angle measured clockwise from the positive x-axis.)

A child m = 30 kg runs at vi = 5 m/s tangentially to a small playground merry-go-round, aiming at the edge with idea of jumping on and spinning around. The merry-go-round has mass 80 kg, radius 1m, and can be modeled as a thin solid disk.

1. What is the angular speed of the merry-go-round after the child jumps on?

2. After the merry-go-round turns through 270◦ , the child jumps off the merry-go-round radially and tumbles away at vf = 0.75 m/s. What is the angular speed of the merry-go-round after the child jumps off?

3. What force was applied to allow the child to change his or her linear momentum (comparing before and after interacting with the merry-go-round)?

The mass of a particular eagle is twice that of a hunted pigeon. Suppose the pigeon is flying north at vi,2=16.3 m/s when the eagle swoops down, grabs the pigeon, and flies off. At the instant right before the attack, the eagle is flying toward the pigeon at an angle θ=51.5 below the horizontal and a speed of vi,1=37.5m/s

What is the speed of the eagle immediately after it catches its prey?

What is the magnitude of the angle, measured from horizontal, at which the eagle is flying immediately after the strike?

1. Consider a tax on the producers in a market. By using supply and demand curves, show the consumer surplus, producer surplus, the equilibrium price and quantity traded before tax. Now show the consumer surplus, producer surplus, equilibrium price and quantity traded after tax.
2. Finally make sure to show the revenue of the tax and the deadweight loss associated with the tax. Now do the same exercise in part-c by assuming a tax on consumers.
3. What happens to consumer surplus, producer surplus, equilibrium price and quantity traded after tax?