Thursday
October 23, 2014

Posts by qpt


Total # Posts: 30

Chemistry
how to convert j/mol to EV?
January 11, 2013

Chemistry
frequency(wavelength)=speed of light. solve for frquency.
January 11, 2013

Chemistry
a) 6.22*10^18 No idea for b) any thoughts or how to for b)?
January 11, 2013

Chemistry
How do you use the above data and insert into the formula?
January 11, 2013

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
January 11, 2013

Chemistry
Could someone insert the formula and data, at least it gives an idea in how-to answer the question?
January 11, 2013

Chemistry
Still having problems with this one! Any thoughts!
January 11, 2013

chemistry
same here had 39.2 as the wrong answer.
January 11, 2013

Chemistry
Could someone give the formula and where the data is inserted?
January 11, 2013

Chemistry
Any ideas for b)
January 11, 2013

Chemistry
thank you
January 11, 2013

Chemistry
Yup it gave me a big red X.
January 11, 2013

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?
January 11, 2013

Chemistry
a)3.03*10^-8 b) 2.14*10^-8 any ideas for c)?
January 11, 2013

Chemistry
Any ideas for b) ?
January 11, 2013

Chemistry
Thks :)
December 18, 2012

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
December 18, 2012

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 ...
December 18, 2012

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 ...
December 18, 2012

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 ...
December 15, 2012

Chemistry (balloon)
How did you get it? could you show the data in the formula? Thank you
December 15, 2012

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)
December 15, 2012

Chemistry
Did not get it right! could you input the data above into the formula? Thank you
December 14, 2012

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)
December 14, 2012

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)
December 14, 2012

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...
December 14, 2012

Chemistry
How did you convert kg/s to g/hr
December 14, 2012

Chemistry
42.8 is wrong! could you input the data above into the formula? Thank you
December 14, 2012

Chemistry
can someone give me a formula? and what data to use in the formula? thank you
December 14, 2012

Chemistry
Thank you for the info, great help
December 14, 2012

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