For each of the mathematical expressions given: 1. Tell the correct number of significant figures for the answer. 2. Evaluate the mathematical expression using correct significant figures in the result. 29.3 (284 x 4.2) 15.2 2.75+ 16.67 3.984 x 2.16 0.0714.36 2.17+ 4.32 + 401.278 + 21.826 17.1 +0.77 Number of Significant Figures Result

For each of the mathematical expressions given: 1. Tell the correct number of significant figures for the answer. 2. Evaluate the mathematical expression using correct significant figures in the result. 29.3 (284 x 4.2) 15.2 2.75+ 16.67 3.984 x 2.16 0.0714.36 2.17+ 4.32 + 401.278 + 21.826 17.1 +0.77 Number of Significant Figures Result

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter1: Basic Concepts Of Chemistry

Section: Chapter Questions

Problem 27RPS: To determine the average mass of a popcorn kernel, you collect the following data: Plot the data...

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Perform the following mathematical operations, and express the result to the correct number of significant figures. a. 2.5263.1+0.4700.623+80.7050.4326 b. (6.404 2.91)/(18.7 - 17.1) c. 6.071 105 - 8.2 106 - 0.521 104 d. (3.8 1012 + 4.0 1013)/(4 1012 + 6.3 10l3) e. 9.5+4.1+2.8+3.1754 (Assume that this operation is taking the average of four numbers. Thus 4 in the denominator is exact.) f. 8.9258.9058.925100 (This type of calculation is done many times in calculating a percentage error. Assume that this example is such a calculation; thus 100 can be considered to be an exact number.)
Many times errors are expressed in terms of percentage. The percent error is die absolute value of the difference of the true value and the experimental value, divided by the true value, and multiplied by 100. Percenterror=truevalue-experimentalvaluetruevalue100 Calculate the percent error for the following measurements. a. The density of an aluminum block determined in an experiment was 2.64 g/cm3. (True value 2.70 g/cm3.) b. The experimental determination of iron in iron ore was 16.48%. (True value 16.12%.) c. A balance measured the mass of a 1.000-g standard as 0.9981 g.
Find the difference between the value of x2 and the sum of x1 plus x3.; let x4 be equivalent to the sum of x1 and x3 and let x5 be the difference between x2 and x5. This calculation scheme is shown below. Make notes about any similarities or differences between the values in your notes. x4 = x1 + x3 x5 = x2 – x4 Data Analyis This section will include all data collected during the lab. Thermochemical Data Tinitial (°C) Tfinal (°C) ΔT (°C) moles NaOH qreaction (kJ) ΔHrxn Reaction 1 25.0 30.3 +5.3 0.025 -1.11 -44.4 Reaction 2 25.0 37.0 +12.0 0.025 -2.51 -100.4 Reaction 3 25.0 31.7 +6.7 0.025 -1.40 -56.1 Reaction 1: NaOH(s) → Na+(aq) + OH-(aq) + x1 kJ 1g /39.977g/mol = 0.025 moles Moles NaOH = 0.025 qsolution = (4.184 J/g °C) (50.0g) (30.3°C -25.0°C) = -1108.76 J/ 1000 qreaction (kJ) = -1.11 kJ ΔH = -1.11 kJ/ 0.025 moles ΔHrxn = -44.4 kJ/mol…
Round each answer to the correct number of significant figures. 9 +2.8 - 0.135+10.8=22.265 My previous answer was 22.3 it was incorrected.
Express each result to the proper number of significant figures 0.00071+0.002+0.00008 0.9827-0.06 14.9164-10.08+3282 8.13 x 102+8.13 x 103 1.784 x 104-3.6738 x 103 5.4989 x 10-3-1.5300 x 10-2
You are given four values (1.033, 4.157, 1.05, and 4.6) and asked to conduct calculations on them. You perform a series of mathematical operations using the values and make a table that includes the calculated value as displayed on your calculator: Mathematical operation Value displayed by calculator 1.033 +4.157 +1.05+4.6 10.8400 1.033 x 1.05 1.08465 4.157 - 1.05 3.10700 4.157/31.0341 0.133949 4.6/31.0341 0.148224 Round each of the values displayed by the calculator to the correct number of significant figures, and place the value in the bin that correctly indicates the number of significant digits you rounded to. Drag the appropriate items to their respective bins. » View Available Hint(s) Reset Help 10.8400 1.08465 3.10700 0.133949 0.148224 1 significant figure 2 significant figures 3 significant figures 4 significant figures
7) (3.4617x 102) (5.61 x 10-4) (9.87x 105) (3.1) (1.171 x 104) = 8) (3.52164 x 102)(3.1741 x 105) (8.22 x 107) (4.65217 x 10-3) (9.711 x 104) 9) (1.8741 x 1011) (5.6 x 104) (2.173 x 108) || 10) (1.745 X 100) (9.51 x 107) = (16.21) (9.346 x 10-10)
For the following calculations and questions, use all applicable rules of sig figs and rounding to determine the answers: 0.53 x 12.3 x 1.321 = 15.1 + 20. + 130 = How many sig figs in the number 0.00040 How many sig figs in the number 500. What is the exact answer to 8.00/4.00 =
Express each result to the proper number of significant figures 5698 x 0.0439 0.005493/(28.000 x 10-1) 3.14 x 22.00 x 166/12 (45.0 x 102)2 (35.67 x 10-5)1/3 (44.963-44.960) x 7.3182 82.32-79.4/365.99
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part A: Sort the following numbers according to whether they should be rounded up or down when rounding to the nearest tenth (the first digit after the decimal). 3.1760, 4.319, 19.47, 5.82, 66.9214, 8878.2010, 7.084, 124.76 part B: Drag the answers that have been correctly rounded to the appropriate number of significant figures to their place in the table. To avoid rounding errors, start with the unrounded value before conducting each manipulation. Drag the appropriate labels to their respective targets. View Available Hint(s)for Part B Reset Help 14.93 Group 3 14.93 12 Group 1 12 14.92 Group 3 14.92 3.62 Group 4 3.62 14 Group 3 14 3.7 Group 4 3.7 15 Group 3 15 3.6 Group 4 3.6 15.0 Group 3 15.0 3.63 Group 4 3.63 14.9 Group 3 14.9 3.623 Group 4 3.623 12.47 Group 1 12.47 7.97 Group 2 7.97 12.46 Group 1 12.46 7.966 Group 2 7.966 12.4 Group 1 12.4 7.0 Group 2 7.0 13 Group 1 13 7.96 Group 2 7.96 12.5 Group 1 12.5 8.0 Group 2 8.0 3.622 Group 1…
5) significant figures should be retained in the result of the following calculation: (354.0 + 21.01) x 107 (0.012 + 2.30) x 10² 1 O O