1. on a hot summer day the temperature inside a room is 36 °c, barometer pressure is 763 mmHg and the relative humidity is 20%. A "cold-mist" vaporizer was installed to add moisture to the room. The room measure 5mx5mx4m. Calculate weight of water vaporized to completely saturate the room.

2. A stream of air at 40°C and 760 mmHg contains 20% water by volume.calculate:
a) The percentage of the vapour rhat condenses and the final composition of the gas phase if the air is cooled to 10°c at constant pressure.
b) The percentage of the vapour that condenses and the final composition of the gas phase if, instead of being cooled, the air is compressed isothermally to 1520 mmHg.
3. Air at 25°c with a dew point of 5°c enters a humidifier. The air leaving the unit has an absolute humidity of 0.01 kg of water per kilogram of dry air. the barometer reads 760 mmHg.
a) Calculate the kg of water that must be evaporated into the air for every 100 kg of dry air entering the unit.
b)if the air leaving the unit is saturated, what will be the temperature of this air?
4. it ia proposed to recover acetone, which is used as a solvent in an extraction process, by evaporation into a stream of nitrogen. The nitrogen entera the evaporator at a temperature at 30°c containing acetone such that is dew point is 10°c. it leaves at a temperature of 25°c with a dew point of 20°c. The barometric pressure is constant at 750 mmHg.
a) Calculate the moles of vapour evaporated per mole of vapour-free gas passing the evaporator
b) Calculate the weight of acetonr per 1000m^3 of gases entering the evaporator.
5. A mixture of dry air and NH3 enters an absorption tower at a rate of 100 ft^3/min at 27°c and 740 mmHg with 95% saturation. The vapour pressure of NH3 at 27°c is 50 mmHg. The gas leaves the tower at 730 mmHg and 20°c and contains 0.15% mol NH3. Calculate the kg NH3 in the liquid leaving the tower if the water enters the tower at 10 kg/min.

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq). The ionization constant for HClO can be found here. A. before any KOH is added B. after 25.0 ml is added c. after 30.0 ml is added d. after 50.0 ml is added e. after 60.0 ml is added please help!

How many grams of dipotassium succinate trihydrate (K2C4H4O4�3H2O, MW = 248.32 g/mol) must be added to 530.0 mL of a 0.0449 M succinic acid solution to produce a pH of 5.835? Succinic acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).

what volume of 0.250 M HNO3 (nitric acid) reacts with 44.8ml of 0.150 M na2co3 ( sodium carbonate) in the following equation?

2HNO3(aq)+Na2co3(aq)-------2nano3(aq)+h20+co2

How does the principle of "like dissolves like" explain the different solubilities of solutes in various solvents?

and

What amount, in grams solute per 100 mlL solvent, classifies a solute eas being "souble" in a particular solvent?

1.152 g of N-2-acetamido-2-aminoethane-sulfonic acid potassium salt (ACES–K , MW = 220.29 g/mol) is dissolved in 87.80 mL of water. 10.56 mL of HCl is added to the solution, resulting in a pH of 7.45. Calculate the concentration of the HCl solution. The pKa of ACES is 6.85.

how would adding acid to a buffer solution would change the value of ph?

Will the pH value increase or decrease?

what if we add base to a buffer solution? how would that change the value of pH of the buffer? increase or decrease ?

and could you please explain why?

Thanks!

Consider the titration of 25.0 mL of o.0500 M Sn2+ with 0.100 M Fe3+ in 1 M HCl to give Fe2+ and Sn4+, using Pt and calomel electrodes. (a) Write a balanced titration reaction (b) Write two half-reactions for the indicator electrode. (c) Write two Nernst equations for the cell voltage. (d) Calculate E at the following volumes of Fe3+: 1.0, 12.5, 24.0, 25.0, 26.0, and 30.0 mL. Sketch the titration curve.

Specify the electron configurations for each of the following ions.

1) V3+ and Mo3+

2) Arrange the following isoelectronic series in order of increasin radius: Br^- , Y^3+ , Se^ 2-, Sr^+, and Rb^+

3) Arrenge the following elements in order of decreasing first ionization energy : Bi, Cl, Sb, and Se. (Rank elements from largest to smallest.

4) Arrange the following elements in order of decreasing metallic character. Rb, F, C, O, Zn and Ge. (Rank elements from most to least metallic character).

a) Schematically plot IR spectra of a N2, 14^NO and 15^NO. List all differences between these spectra. How many translational, rotational and vibrational degrees of freedom are in these molecules?

b) Sketch the potential that more accurately represents vibrations in diatomic molecules and compare it to the harmonic potential. Compare the energies in both cases. List all differences.

Synthesis of Banana Oil: What are the gram components of each distillate? What is the percent yield from the peak area?

2.16 mL Isopentyl alcohol, 2.3 mL glacial acetic acid, and 0.15mL of sulfuric acid was used to form 1.3407 g of "banana oil"

A gas chromatogram revealed that our final product contained 4 peaks. 1. 0.412 @ 9.90458 % area, 2. 1.481 @ 1.30885% area, 3. 1.722 @ 3.14633% area, and 4. 2.040 @ 85.64024% area. How can I calculate the percent yield from each peak area?

1. Describe how PPV is made and how it acts as a light emitting diode.
2. Describe how its structure can be altered to change the color of light emitted by the LED.
3. Summarize the benefits and drawbacks of OLEDS over inorganic semiconductors.

Titration of acid with base is an exothermic reaction. Neutralization of 15 mL of H3PO4 acid with 8 mL potassium hydroxide released 780 J heat. Find molarity of the acid and the base?

H3PO4 (aq) + 3 KOH (aq) = K3PO4 (aq) + 3 H2O (l)    

Delta H X rxn = -124.8 kJ

Why is UV-light used for the “reading” of the TLC-plate?