June 2017 NY Regents Chemistry Exam

33 A student measures the mass and volume of a sample of copper at room temperature and 101.3 kPa. The mass is 48.9 grams and the volume is 5.00 cubic centimeters. The student calculates the density of the sample. What is the percent error of the student’s calculated density? (1) 7.4%

(2) 8.4%

(3) 9.2%

(4) 10.2%

Solution: Table T on the Reference Table has an equation for calculating % error which is % error =(measured value – accepted value)/accepted value × 100

Table S provides the accepted values for density of each element. All we need to do is find copper density in Table S (accepted value) and plug it in along with the density given in the question (measured value).

Answer: 3

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