A 7.70-L container holds a mixture of two gases at 35 °C. The partial pressures of gas A and gas B, respectively, are 0.190 atm and 0.891 atm. If 0.230 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?

For two dimensional particle in a box, how many electrons can we get at most in the first energy level and why?

the Santa Ana winds are strong within Southern California. what drives this phenomenon?
(With respect to Gibbs and Helmholtz's eqn)
Physical chemistry question

A) How many grams of solid sodium fluoride should be added to 1.00 L of a 0.218 M hydrofluoric acid solution to prepare a buffer with a pH of 3.847 ?

grams sodium fluoride =  g.

B)How many grams of solid sodium hypochlorite should be added to 0.500 L of a 0.297 M hypochlorous acid solution to prepare a buffer with a pH of6.803 ?

grams sodium hypochlorite =  g.

C)How many grams of solid ammonium chloride should be added to 1.50 L of a 0.152 M ammonia solution to prepare a buffer with a pH of 8.330 ?  

grams ammonium chloride =  g.

How do you calculate the concentration in ppm from a gas chromatograph? The chromatograph is from a BTEX mixture and shows a peak for each component of the mixture. Bromobenzene was used as an internal standard. How can you calculate the concentration of each component using the ratios of peak area? Is there a specific equation for this?

Thank you!

A scientist dilutes 40.0 mL of a pH 5.85 solution of HCl to 1.00 L. What is the pH of the diluted solution (Kw = 1.0 × 10⁻¹⁴)?

a)     What are the molecules and ions doing in solution – are they static or moving around? 


b)    Can ions or molecules that are isolated from one another react? What must happen for them to react? 


c)     Why should the permanganate disappear faster if the concentration of H3O+(aq) is higher? 


d)    Devise a general, qualitative, statement about the effect that an increase in the concentration of a reactant has on the rate of a reaction, and an explanation of that effect. 


Chromium forms cubic crystals whose unit cell has an edge length of 288.5 pm. The density of the metal is 7.20 g/cm3. The atomic weight of Cr is 51.996 amu.
a) Calculate the number of atoms in a unit cell, assuming all atoms are at lattice points.
b) What type of cubic lattice does chromium have?
c) Calculate the radius of the Cr atom.
d) Calculate the empty volume of the cell.


Since I have the edge length, I'm pretty sure I cube that for volume and convert that to cm. Because I also have the density, I can use my calculated volume to find the mass. I also know the equation for this problem involves Avogado's number (6.022x10^-23) I just don't know how to find the answers to these questions, only an idea how to begin solving.

Can anyone help? Unfortunately there is no answer key so I can't even check if I'm right!

A solution is made by mixing exactly 500.0 mL of 0.167 M NaOH with exactly 500.0 mL of 0.100 M CH₃COOH. Calculate the equilibrium concentrations of H₃O⁺, CH₃COOH, CH₃COO^-, OH^-, and Na⁺.

[H₃O⁺] = M

[CH₃COOH] =    M

[CH₃COO^-] =    M

[OH^-] = M

[Na⁺] = M

In the chemiluminesence reaction, a diene is generated on the luminol molecule. Why does the reaction not progress from that point forward as a Diels-Alder reaction with molecular oxygen acting as the dienophile? How does ground state molecular oxygen exist and does this affect the possibility of a Diels-Alder mechanism with O2?

The complex ion Cu(NH3)42 is formed in a solution made of 0.0400 M Cu(NO3)2 and 0.500 M NH3. What are the concentrations of Cu2 , NH3, and Cu(NH3)42 at equilibrium? The formation constant*, Kf, of Cu(NH3)42 is 1.70 × 1013.

a. What effect does the temperature of the solutions have on the rate of the reaction? 


b. How does heating the reaction mixture affect the energy of the species in solution? What effect would cooling the reaction mixture have on the energy of the species in solution? 


c. Write a general, qualitative, statement about how the rate of a reaction depends on the temperature at which the reaction is carried out. 


A solution containing 10.00 mL of 0.0500 M metal ion buffered to pH = 10.00 was titrated with 0.0400 M EDTA. Calculate the fraction (αY4-) of free EDTA in the form Y4−. Keep 2 significant figures.

A rigid container has water of 2 kg at 120 C with a quality of 25%. The container is heated to the temperature of 140 Celsius, calculate the new quality?