141. Solving a chemistry problem
Seller: Derkach
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Product description
A weighed portion of an organic compound weighing m g was burned in a stream of oxygen. In gaseous pyrolysis products, water was frozen, and carbon dioxide was passed into a cell for measuring electrical conductivity containing a Ba (OH) 2 solution. The resistance of the solution in the cell before and after the experiment changed by dRx.
Standard substances containing from 200 to 1000 μg carbon were burned under similar conditions, and the dR value was also measured for each sample. The measurement results are presented below:
Sample carbon content. μg 200 400 600 800 1000
dR * 10 ^ -6, Ohm 80 150 220 285 355
Build a calibration graph and calculate the mass fraction (%) of carbon in an organic compound using the following data:
Option 1
m, mg 1.221
dRx * 10 ^ -6, Ohm 90
Additional information
If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.