General Chemistry 4th Edition University Science Books presented by Sapling Lear

Question

General Chemistry 4th Edition University Science Books presented by Sapling Learning A handbook lists the density of lead as 11.3 g/mL. Several groups of students are attempting to determine measured by each group, and the percentage error in each average. Measured Trial 1 Densities ! Trial 2 Group 1 Group 2 Group 3 12.7 11.2 11.5 11.4 11.4 Number 10.9 11.3 11.1 Number (g/m)Trial 3 10.3 Number Density I (g/mL) Number Number Number Percent Error Which group was most accurate? Which group was most precise? O Group 1 O Group 2 O Group 3 O Group 1 O Group 2 O Group 3 Previous Give Up & View Solution check Answer QNext -elE

Explanation / Answer

For Group 1

Average Density = (12.7+11.2+10.3)/3 = 11.4 g/mL

Percent Error = |Exact value - calculated value|/Exact value * 100 = 0.1/11.3 * 100 = 0.8849%

For Group 2

Average Density = (11.5+11.4+11.4)/3 = 11.433 g/mL

Percent Error = |Exact value - calculated value|/Exact value * 100 = 0.133/11.3 * 100 = 1.176%

For Group 3

Average Density = (10.9+11.3+11.1)/3 = 11.1 g/mL

Percent Error = |Exact value - calculated value|/Exact value * 100 = 0.2/11.3 * 100 = 1.769%

Accurate means the percentage error must be least, hence the most accurate group will be Group 1

Precise means the sample values are too close to each other which is in group 2

Related Questions

Navigate

• Browse (All)
• Browse G
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.