Introductory Chemistry: A Foundation
8th Edition
ISBN: 9781285199030
Author: Steven S. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Chapter 2, Problem 3QAP
When a large or small number is written in standard scientific notation, the number is expressed as the product of anumberbetween 1 and 10, multiplied by the appropriatepowerof 10. For each of the following numbers, indicate what number between 1 and 10 would be appropriate when expressing the numbers in standard scientific notation.
- 9651
- 0.003521
- 93,241
- 0.000001002
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Perform the operation and express your answer in scientific notation with the correct number of signif-
icant figures. If there are units, make sure that the units of the answer are correct.
1. 0.000123 + 0.239
dods
2. 9.457/0.23
3. 0.123 + 5.321/34.213
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…
Perform the calculation shown. What is the answer rounded to the correct number
of significant figures? Include the correct unit.
Be Careful!! BE SURE you only include the correct number of significant figures
based on this operation as that is what this question is really checking.
(3.336x10^8) g divided by (1.1x10^-1) mL
Note: Your answer is assumed to be reduced to the highest power possible.
Your Answer:
Answer
x10
units
Chapter 2 Solutions
Introductory Chemistry: A Foundation
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