Posted by Aman on Friday, November 16, 2007 at 12:14pm.
Volume of stock solution
a. 5.0mL b.10.0mL c.15.0mL d.20.0mL
Prepare 25mL of each of the four different dilute solution
Concentration of stock 1.01E5
Calculate molarity for a,b,c,d
Molarity=m1V1/V2
for a would the answer be 2.02E6?????
(1.01E5)(5.0)/(25.0)

Chem Urgent  DrBob222, Friday, November 16, 2007 at 12:20pm
Yes, the answer is what you posted EXCEPT the exponenet is 6 and not +6. Also, you don't say if th e stock solution is molar, molal, or what. Your answer is ok if the stock solution is 1.01E5 MOLAR

Chem Urgent  Aman, Friday, November 16, 2007 at 1:06pm
Its Molar. Thanks

Chem Urgent  Aman, Friday, November 16, 2007 at 2:04pm
If for a. the concentration is 2.02E6, Wavelength at 630, Absorbance is .216, how would I find the %T.

Chem Urgent  DrBob222, Friday, November 16, 2007 at 3:56pm
Absorbance = 1/T OR 100/%T.

Chem Urgent  Aman, Friday, November 16, 2007 at 4:14pm
What do you mean? I know the equation is %T=It/Io*100
A=log(Io/It)=logT
I don't know how to use it and plug in the information I have. 
Chem Urgent  DrBob222, Friday, November 16, 2007 at 4:43pm
Use your calculator.
A = log (1/T)
0.216 = log (1/T)
1.644 = 1/T
T = 0.608
%T = 60.8%