Quantitative chemical analysis. Please show some work, Ill choose best correct a
ID: 872224 • Letter: Q
Question
Quantitative chemical analysis. Please show some work, Ill choose best correct answer asap. Thanks! The quantity of acetylene (HC + CH) in a gas mixture was measured by mass spectrometry, in which the signal for mass number 26 is proportional to the volume percent of acetylene. Subtract the value (0.2 mV) from each measured signal. Prepare a graph to find the volume percent of acetylene in the unknown. Use the method of least squares to find the uncertainties in slope and intercept of your graph and to estimate the uncertainty in the answer to part (a).Explanation / Answer
Create this table using Excel:
Gas sample
Spike, %
Signal
Sinal -0.2
Signal -0.2-10.6
Blank
0
0.2
0.0
unknown
0
10.8
10.6
0.0
3
0.072
17.1
16.9
6.3
4
0.121
20.2
20.0
9.4
5
0.200
30.0
29.8
19.2
6
0.364
44.6
44.4
33.8
And select the following values for a calibration function:
Spike, %
Signal -0.2-10.6
0
0.0
0.072
6.3
0.121
9.4
0.200
19.2
0.364
33.8
Import these data in Excel and create the graph, I can
Gas sample
Spike, %
Signal
Sinal -0.2
Signal -0.2-10.6
Blank
0
0.2
0.0
unknown
0
10.8
10.6
0.0
3
0.072
17.1
16.9
6.3
4
0.121
20.2
20.0
9.4
5
0.200
30.0
29.8
19.2
6
0.364
44.6
44.4
33.8