Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

8. Gases, Liquids and Solids

Pressure Units

GOB Chemistry

8. Gases, Liquids and Solids

Pressure Units

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1:59 minutes

Problem 7

Textbook Question

A local weather station reports the barometric pressure as 29.5 inHg (inches of Hg). Convert this pressure to torr and to atm.

Verified step by step guidance

Step 1: Understand the problem. The goal is to convert the given pressure of 29.5 inHg (inches of mercury) into two different units: torr and atm (atmospheres). To do this, we need the appropriate conversion factors.

Step 2: Recall the conversion factors. The relationships between the units are as follows: 1 inHg = 25.4 mmHg (millimeters of mercury), and 1 mmHg = 1 torr. Additionally, 1 atm = 760 torr.

Step 3: Convert inches of mercury (inHg) to torr. First, use the conversion factor 1 inHg = 25.4 mmHg to convert 29.5 inHg to mmHg. Then, since 1 mmHg = 1 torr, the value in mmHg will be numerically equal to the value in torr. Use the formula: \( \text{Pressure in torr} = \text{Pressure in inHg} \times 25.4 \).

Step 4: Convert torr to atm. Use the conversion factor 1 atm = 760 torr. Divide the pressure in torr by 760 to find the pressure in atm. Use the formula: \( \text{Pressure in atm} = \frac{\text{Pressure in torr}}{760} \).

Step 5: Summarize the process. You have now converted the pressure from inHg to torr and then from torr to atm using the appropriate conversion factors. Ensure all units are properly labeled in your final answers.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Barometric Pressure

Barometric pressure is the pressure exerted by the weight of the atmosphere at a given point. It is commonly measured in units such as inches of mercury (inHg), torr, and atmospheres (atm). Understanding barometric pressure is essential for meteorology and various scientific applications, as it influences weather patterns and altitude measurements.

Unit Conversion

Unit conversion is the process of converting a quantity expressed in one set of units to another. In this context, converting barometric pressure from inches of mercury to torr and atmospheres requires knowledge of the relationships between these units. For example, 1 inHg is equivalent to 25.4 torr and approximately 0.968 atm, which are crucial for accurate scientific communication.

Torr and Atmosphere

Torr and atmosphere (atm) are both units of pressure. The torr is defined as 1/760 of an atmosphere, making it a convenient unit for measuring low pressures, such as those found in weather reports. Understanding these units is important for interpreting pressure readings and performing calculations in various scientific fields, including physics and engineering.