# Posts by qpt

Total # Posts: 30

Chemistry
how to convert j/mol to EV?

Chemistry
frequency(wavelength)=speed of light. solve for frquency.

Chemistry
a) 6.22*10^18 No idea for b) any thoughts or how to for b)?

Chemistry
How do you use the above data and insert into the formula?

chemistry
Molar mass of PbO: 446.4 g/mol Molar mass of Pb: 621.6 g/mol (830000g/446.4)*621.6 = convert answer from g to kg

Chemistry
Could someone insert the formula and data, at least it gives an idea in how-to answer the question?

Chemistry
Still having problems with this one! Any thoughts!

chemistry

Chemistry
Could someone give the formula and where the data is inserted?

Chemistry
Any ideas for b)

Chemistry
thank you

Chemistry
Yup it gave me a big red X.

Chemistry
(a) 10^-12*27*(x)^4 replace x with the solubility you have 10^-12*27(4.891 x 10-3)^4 x=4.891x10^-3 (as taken from a)*is this the solubility 1.54509225456e-20 (it was wrong) What when wrong?

Chemistry
a)3.03*10^-8 b) 2.14*10^-8 any ideas for c)?

Chemistry
Any ideas for b) ?

Chemistry
Thks :)

Chemistry
One chirality of CH3CHlCOOH is shown below. Identify the image(s) below that exhibit the opposite chirality. Select all that apply. I)Top Left Molecule II)Bottom Right Molecule III)Bottom Left Molecule IV)Top Right Molecule

Chemistry
Butene H2C=CH-CH2-CH3 can be reacted to form isotactic polybutene (PB). (a) Would you expect isotactic polybutene to melt at a higher or lower temperature than atactic polybutene of the same molecular weight? I)Higher T II)Lower T (b) Is isotatic polybutene a thermoplastic or ...

Chemistry
H8P1: Polystyrene The monomer structure of polystyrene is shown below: (a) Would you expect polystyrene to be a stiff or a pliable polymer? I)Stiff II)Pliable (b) What kind of synthesis is used in the production of polystyrene from styrene monomers? I)Addition polymerization ...

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.31 kg m-3. Under these conditions the total surface area of the balloon is 0.11 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...

Chemistry (balloon)
How did you get it? could you show the data in the formula? Thank you

Chemistry
Step 1: (0.5*6695.0 - 6695.0)/ (359.5 - 6695.0)= erf(ξ) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 d=38.0 x 10-2 cm D=3.091 x 10-7 cm2/s Step 4: t in sec -> hours Conversion seconds to hours is total/(60x60)

Chemistry
Did not get it right! could you input the data above into the formula? Thank you

chemistry
ξ= (0.5 * carbon concentration at the surface of the steel - carbon concentration at the surface of the steel)/ (carbon concentration in the steel before carburization - carbon concentration at the surface of the steel)

Chemistry
ξ= (0.5 * carbon concentration at the surface of the steel - carbon concentration at the surface of the steel)/ (carbon concentration in the steel before carburization - carbon concentration at the surface of the steel)

chemistry
Step 1: ξ= (0.5 * carbon concentration at the surface of the steel - carbon concentration at the surface of the steel)/ (carbon concentration in the steel before carburization - carbon concentration at the surface of the steel) (0.5* 7215.0 - 7215.0 )/ ( 244.5 - 7215.0...

Chemistry
How did you convert kg/s to g/hr

Chemistry
42.8 is wrong! could you input the data above into the formula? Thank you

Chemistry
can someone give me a formula? and what data to use in the formula? thank you

Chemistry
Thank you for the info, great help