High School Calculating Uncertainty of Mean Values for Enthalpy Change Measurements

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SUMMARY

The discussion focuses on calculating the uncertainty of the mean values for enthalpy change measurements of various alcohols, specifically the values −283 ± 11, −175 ± 9, and −282 ± 11. Participants emphasize the importance of using the rules for propagation of uncertainties when averaging independent measurements. Additionally, it is noted that averaging should only be done if the measurements represent the same quantity, highlighting the need for careful consideration in data interpretation.

PREREQUISITES
  • Understanding of uncertainty propagation in experimental measurements
  • Familiarity with statistical analysis of independent values
  • Knowledge of enthalpy change concepts in thermodynamics
  • Basic proficiency in handling experimental data
NEXT STEPS
  • Research the rules for propagation of uncertainties in measurements
  • Learn about statistical methods for analyzing independent experimental data
  • Explore the concept of enthalpy change in various chemical reactions
  • Investigate best practices for averaging measurements in scientific experiments
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Researchers, chemists, and students involved in experimental physics or chemistry, particularly those focused on thermodynamic measurements and data analysis.

Squidiemeister
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I am trying to find the uncertainty of the mean of 3 values.
These values were calculated from experiments to calculate the enthalpy change of various alcohols.
These values are independent values.

−283 ± 11, −175 ± 9, −282 ± 11

How would I calculate the uncertainty of these values?
Thank you.
 
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If those numbers are supposed to be measurements of the same thing, I wouldn't average them. Do you know why?
 

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