General Chemistry Answers

It refers to the experimental estimation of the amount of reagent that reacts completely with the analyte in a volumetric titration.

a) Calculate the distance travelled by an electron when it moves form 1st shell to 3rd shell of hydrogen atom.

b) Also calculate the amount of energy needed to send the electron from 1st to 3rd shell of hydrogen atom.

Where does preserving food fall in chemistry subject? Which concept in General Chemistry II can be best applied to understand this phenomenon?

 75 ml of 1.0 M lactic acid and 25 ml of 1.0 M sodium acetate. Ka of Lactic acid = 1.38 x10-4

The Neches Butane Products Co. makes butadiene, C,Hg. by separating butenes. C,Hg. from refinery gases piped to them, and then further dehydrogenating the butenes to butadiene. In order to increase capacity they would like to be able to dehy- drogenate butane, C,H10, in one step without the intermediate separation of the butene. The CH formed would be separated, and any unreacted C,H10 or C,H would be recycled to the reactor. One of the large engineering companies claims to have such a process. You have just been employed by Neches B.P. Co.-fresh from school-and are requested to make some calculations on the proposed process: CH,p(1) C,H(g) + 2H,(g) By heat exchange, the butane fed into the reactor is brought to the reaction tempera- ture of 1000 K. It is desired to maintain an isothermal reactor. How much heat must be added or removed per g mole of butadiene formed? Assume the pressure is 100 kPa. What are some reasons why the heat load may be different from the value you calculate?

The Neches Butane Products Co. makes butadiene, C,Hg. by separating butenes. C,Hg. from refinery gases piped to them, and then further dehydrogenating the butenes to butadiene. In order to increase capacity they would like to be able to dehy- drogenate butane, C,H10, in one step without the intermediate separation of the butene. The CH formed would be separated, and any unreacted C,H10 or C,H would be recycled to the reactor. One of the large engineering companies claims to have such a process. You have just been employed by Neches B.P. Co.-fresh from school-and are requested to make some calculations on the proposed process: CH,p(1) C,H(g) + 2H,(g) By heat exchange, the butane fed into the reactor is brought to the reaction tempera- ture of 1000 K. It is desired to maintain an isothermal reactor. How much heat must be added or removed per g mole of butadiene formed? Assume the pressure is 100 kPa. What are some reasons why the heat load may be different from the value you calculate?

1.Hydrogen fluoride , HF exists as liquid at room emperature . Explain this phenomenon based on the formation of hydrogen bonds .

2.Explain why paper sticks together when wet.

can hydrogen bonds form among hydrogen chloride moleciules,HCL? justify your answer

Consider the titration of 50.0 mL of 0.0200 M In+ by 0.0500 m Cu2+ using Pt and

saturated calomel electrodes to find the end point.

a. Write a balanced titration reaction.

b. Write two different half-reactions for the indicator electrode.

c. Write two different Nernst equations for the net cell reaction.

d. Calculate E at the following volumes of Cu2+: 1.00, 20.0, 39.0, 40.0, 41.0, and 80.0

mL. Sketch the titration curve.

2. Consider the titration of 50.0 mL of 0.0250 M Fe3+ by 0.0500 M Cu+ to give Fe2+ and Cu2+ ,

using Pt and saturated AgAgCl electrodes to find the end point.

a. Write a balanced titration reaction.

b. Write two different half-reactions for the indicator electrode.

c. Write two different Nernst equations for the net cell reaction.

d. Calculate E at the following volumes of Cu2+: 1.0, 12.5, 24.5, 25.0, 25.5 and 30.0

mL. Sketch the titration curve 

This is the question I am having trouble on,

You wish to produce 5.8 g of Fe₂O₃. With how many grams of Fe should you start?