Chem Urgent
posted by Aman .
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)

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

Its Molar. Thanks

If for a. the concentration is 2.02E6, Wavelength at 630, Absorbance is .216, how would I find the %T.

Absorbance = 1/T OR 100/%T.

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. 
Use your calculator.
A = log (1/T)
0.216 = log (1/T)
1.644 = 1/T
T = 0.608
%T = 60.8%
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