with Sigsificant Figures sabtraction. Try these prolblems 6.512 10.29 2, (6.78 x
ID: 588516 • Letter: W
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with Sigsificant Figures sabtraction. Try these prolblems 6.512 10.29 2, (6.78 x 1o-)- (1.4 x 10) Answe 3. 12.5/4.2 9,651 × 1074 8 5, 14.3 + (12.2 x 2.0) 6. 25.6789-2.57 Answer 7. (6.43241 x 10+8.34 x 10'y2.1431 Answer Answer (6.432 × 102 + 8.342 × 101)/214 Answer 9. 12.785-9.43 Answer 10. 12.785-9.44 Note: Errors due to rounding may cause different calculated results. The most accurate method unding errors is to keep track of the number of significant figures present after EACH mathema ep, but to round only when writing the final answer. Appendix II -Significant Figures lisbury University Department of ChemistryExplanation / Answer
Significant figures:
1) 6.512 + 10.29
Just add them and you get 6.512 + 10.29 = 16.802
Answer : 16.802 (5 significant figures)
After rounding to 2 significant figs. we get = 17
2) The question is not clear!
3) 12.5/4.2
Answer : 2.97619048 (9 significant figures)
After rounding to 2 significant figure we get = 3.0
4) 9.651 x 102 + 8
= (9.651 x 102) + 8
= 973.1
Answer : 973.1 (4 significant figures)
Rounding to 3 significant figs = 973
5) 14.3 + (12.2 x 2.0)
= 14.3 + 24.4
= 38.7
Answer : 38.7 (3 significant figures)
6) 25.6789 - 2.57
= 23.1089
Answer: 23.1089 ( 6 significant figures)
after rounding 3 significant figs = 23.1
7) (6.43241 x 10^2 + 8.34 x 10^1)/2.1431
= (643.241 + 83.4)/2.1431
= 726.641/2.1431
= 339.060706453
Answer : 339.060706453 (12 significant figures)
after rounding to 3 sig. figures = 339
8)(6.43241 x 10^2 + 8.34 x 10^1)/2.14
=(643.241 + 83.4)/2.14
= 726.641/2.14
= 339.551869
Answer : 339.551869 (9 significant figures)
after rounding to 3 sig. figures = 339
9) 12.785 -9.43
= 3.355
Answer : 3.355 ( 4 significant figures)
After rounding 3 significant figures = 3.36
10) 12.785 -9.44
= 3.345
Answer: 3.345 ( 4 significant figures)
After rounding to 3 significant figures = 3.35
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