Final answer:
The percent error, determined by subtracting the experimental value from the accepted value, taking the absolute value, dividing by the accepted value, and multiplying by 100%, is approximately 87.58%.
Step-by-step explanation:
To calculate the percent error in a scientific measurement, first we need to subtract the experimental value from the accepted value, take the absolute value of that difference, and then divide by the accepted value. Finally, multiply the result by 100% to get the percent error. For our specific case, the calculation would be as follows:
|experimental value - accepted value| / accepted value x 100% = percent error
|1.24 x 10⁻²g - 9.98 x 10⁻²g| / 9.98 x 10⁻²g x 100% = |(-8.74 x 10⁻²g)| / 9.98 x 10⁻²g x 100%
= 0.875751503006012 x 100%
= 87.58%
The percent error in this case is approximately 87.58%, indicating that the experimental value deviates significantly from the accepted value.