Students in mr. klein’s chemistry class are conducting an experiment to calculate the specific heat of a copper sample. mr. klein requires each lab team to repeat the experiment until their percent error is 2% or less. percent error is calculated using observed values (those students calculate from their lab results) and the true value (the accepted value based on reference). the formula for percent error is: (observed – true) x 100 true if the accepted value for the specific heat of copper is 0.385 j/g°c, which of the following lab teams have an unresolved problem on their hands? a.. team 1: calculates 0.392 j/gºc. b.. team 2: calculates 0.395 j/gºc. c.. both teams. d.. neither team

The correct answer is option (d).

Explanation:

Percentage error=|observed value-true value| 100

According to Mr. Klein each lab team must repeat their experiment until their percent error is 2% or less

The percentage error in team-1 :

Observed value of specific heat of copper =

True value of specific heat of copper =

Percentage error=|observed value-true value| 100 = |0.392-0.385| 100 = 0.7%

0.7% < 2% ,means that team-1 observed value is more accurate.

The percentage error in team-2 :

Observed value of specific heat of copper =

True value of specific heat of copper =

Percentage error=|observed value-true value| 100 = |0.395-0.385| 100 = 1%

1% < 2%,  means that team-2 observed value is less accurate than that of the observed value by team-1.

Since, both errors are less that 2%.Hence, the answer is option (d).

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