[lohjxMARCUS]

Hi all,

i have a problem calculating the stock concentration (in ppm) of a 99% Tetrachloroethylene reagent. From which i would want to prepare standards for creating a calibration curve in GCMS.

Would appreciate help in viewing the way i calculate:

density/concentration -    1.622   g/ml
molar mass-     165.82   g/mol
purity-         99%   

Actual density/concentration of tetrachloroethylene in 1L =
0.99 * 1622 g/L =1605.78g/L

Converting g/L to mg/L =
1605.78g/L * 1000 = 1,605,780 mg/L

is my stock actually 1 605 780mg/L?

i use sigma aldrichs molarity calculator as a reference for my calculations:

http://www.sigmaaldrich.com/chemistry/stockroom-reagents/learning-center/technical-library/molarity-calculator.html

Please assist! thanks!