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    • Thread Starter

    Student 1 repeated her experiment.
    She used the warm water in her beaker from her first experiment, re-weighed the spirit burner and recorded the initial temperature as 60.0°C.
    She burned exactly the same mass of fuel as in her first experiment.
    Her calculated value for the enthalpy change of combustion of methanol was less exothermic than the value from her first experiment.
    Explain why.

    and also,

    Student 2 followed the original instructions provided but did not extinguish the burner after three minutes. When he looked at the clock, 3.5 minutes had passed. He quickly extinguished the flame and measured the temperature of the water as 80.0 °C.
    His calculated value for the enthalpy change of combustion was very similar to that obtained by student 1 in her first experiment.
    Explain why.
    • Thread Starter

    If someone can help, it would be really appreciated!!! thanks!
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