A student calculates the density of a sample of Fe to be 7.57 grams per cubic centimeter. Based on Table S, what is the percent error for the student’s calculated density of Fe?
- Mayya Alocci
- Jan 5
- 1 min read
Regents Chemistry Exam August 2024 Question 31
31 A student calculates the density of a sample of Fe to be 7.57 grams per cubic centimeter. Based on Table S, what is the percent error for the student’s calculated density of Fe?
(1) -0.038% (3) -3.8%
(2) -0.040% (4) -4.0%
Solution:
Percent error formula can be found on Table T on the Reference Table.
% error = (measured value- accepted value)/accepted value *100%
Table S, lists the density of Fe as 7.87g/cm3 (accepted value). Let's plug all the numbers into the formula. % error = (7.57- 7.87)/7.87 *100% = - 3.8%, Choice 3.
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