Question

What are some possible sources of error in this experiment Hess's law?

Answer 1

Improper mixing, placing the thermometer bulb on slowly dissolving particles, inaccurate thermometer readings, not enough thermometer readings, and spillages are all possible sources of experimental error in this experiment. The first two are the most likely sources of inaccuracy.

Hess' law of constant heat summation, or simply Hess' law, is a physical chemistry connection named after Germain Hess, a Swiss-born Russian scientist and physician who published it in 1840. The overall enthalpy change during the whole duration of a chemical reaction is independent of the number of steps executed, according to the rule.

Answer 2

• Hess's law states that when the enthalpy change from State l to State 2 is carried out in a series of small steps like the temperature increase of 30 K is replaced by the raised temperature 15 K, and raised temperature 10 K.
• The enthalpy changes accompanying these steps are each smaller than ∆H.
• The measurements show that the sum of these small enthalpy changes is always equal to Hess's Law.
• The Calorimeter/instrument error can occur while performing the experiment.
• A calorimeter will be used to estimate the enthalpy changes resulting from several chemical reactions under isolated conditions.
• There are various possible sources of experimental error in this experiment include improper mixing.
• The incorrect reading of the thermometer that is used to measure the temperatures.
• And human error can also occur.
• The environmental error can also occur while doing the experiment.