August 2018 NY Regents Chemistry Exam
45 In a laboratory activity, the density of a sample of vanadium is determined to be 6.9 g/cm3 at room temperature. What is the percent error for the determined value? (1) 0.15%
(2) 0.87%
(3) 13%
(4) 15%
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 vanadium's density in Table S and plug it in along with the density given in the question (measured value).
Answer: 4
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