Domanda del libro di testo
Calculate the work done in joules by a chemical reaction if the volume increases from 3.2 L to 3.4 L against a constant external pressure of 3.6 atm. What is the sign of the energy change?
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Ch.9 - Thermochemistry: Chemical Energy
McMurry8th EditionChemistryISBN: 9781292336145
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TOC.tableOfContents
- Ch.1 - Chemical Tools: Experimentation & Measurement170
- Ch.2 - Atoms, Molecules & Ions160
- Ch.3 - Mass Relationships in Chemical Reactions169
- Ch.4 - Reactions in Aqueous Solution199
- Ch.5 - Periodicity & Electronic Structure of Atoms102
- Ch.6 - Ionic Compounds: Periodic Trends and Bonding Theory92
- Ch.7 - Covalent Bonding and Electron-Dot Structures61
- Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure59
- Ch.9 - Thermochemistry: Chemical Energy122
- Ch.10 - Gases: Their Properties & Behavior155
- Ch.11 - Liquids & Phase Changes54
- Ch.12 - Solids and Solid-State Materials73
- Ch.13 - Solutions & Their Properties120
- Ch.14 - Chemical Kinetics98
- Ch.15 - Chemical Equilibrium125
- Ch.16 - Aqueous Equilibria: Acids & Bases110
- Ch.17 - Applications of Aqueous Equilibria147
- Ch.18 - Thermodynamics: Entropy, Free Energy & Equilibrium86
- Ch.19 - Electrochemistry154
- Ch.20 - Nuclear Chemistry96
- Ch.21 - Transition Elements and Coordination Chemistry156
- Ch.22 - The Main Group Elements187
- Ch.23 - Organic and Biological Chemistry51
Capitolo 9, Problema 52
Assume that the nutritional content of an apple-say, 50 Cal (1 Cal = 1000 cal) - could be used to light a light bulb. For how many minutes would there be light from each of the following? (a) A 100-watt incandescent bulb (1 W = 1 J/s)
Guida verificata passo dopo passo1
Step 1: Convert the energy content of the apple from Calories to Joules. Remember that 1 Calorie (Cal) is equivalent to 4184 Joules (J).
Step 2: Convert the power of the light bulb from Watts to Joules per second. Remember that 1 Watt (W) is equivalent to 1 Joule per second (J/s).
Step 3: Calculate the total time the light bulb can be lit by dividing the total energy content of the apple (in Joules) by the power of the light bulb (in Joules per second). This will give you the total time in seconds.
Step 4: Convert the total time from seconds to minutes by dividing by 60, since there are 60 seconds in a minute.
Step 5: The result from step 4 is the total time the light bulb can be lit using the energy from the apple.
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Energy Conversion
Energy conversion refers to the process of changing energy from one form to another. In this context, the nutritional energy from the apple, measured in calories, is converted into electrical energy to power a light bulb. Understanding how to convert calories to joules (1 Cal = 4184 J) is essential for calculating the total energy available for lighting.
Video consigliato:
Percorso guidato
01:56
Conversion Factors
Power and Energy Relationship
Power is the rate at which energy is used or produced, measured in watts (W), where 1 W = 1 J/s. To determine how long a light bulb can operate on a given amount of energy, one must understand the relationship between total energy available and the power rating of the bulb. This relationship allows us to calculate the duration of light by dividing the total energy by the power consumption of the bulb.
Video consigliato:
Percorso guidato
04:42Power and Root Functions Example
Unit Conversion
Unit conversion is the process of converting a quantity expressed in one set of units to another. In this problem, it is crucial to convert the energy from calories to joules and understand the relationship between watts and joules per second. Mastery of unit conversion ensures accurate calculations and helps in understanding how different units relate to each other in the context of energy and power.
Video consigliato:
Percorso guidato
01:56Conversion Factors
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Domanda del libro di testo
A reaction inside a cylindrical container with a movable RAN piston causes the volume to change from 12.0 L to 18.0 L while the pressure outside the container remains constant at 0.975 atm. (The volume of a cylinder is V = pr2h, where h is the height; 1 L # atm = 101.325 J.) (a) What is the value in joules of the work w done during the reaction?
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Domanda del libro di testo
A reaction inside a cylindrical container with a movable RAN piston causes the volume to change from 12.0 L to 18.0 L while the pressure outside the container remains constant at 0.975 atm. (The volume of a cylinder is V = pr2h, where h is the height; 1 L # atm = 101.325 J.) (b) The diameter of the piston is 17.0 cm. How far does the piston move?
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Domanda del libro di testo
At a constant pressure of 0.905 atm, a chemical reaction takes place in a cylindrical container with a movable piston having a diameter of 40.0 cm. During the reaction, the height of the piston drops by 65.0 cm. (The volume of a cylinder is V=pr2h,wherehistheheight;1Latm=101.3J.) (a) What is the change in volume in liters during the reaction?
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Domanda del libro di testo
Which of the following are state functions, and which are not? (a) The temperature of an ice cube
(b) The volume of an aerosol can
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Domanda del libro di testo
Assume that the kinetic energy of a 1400-kg car moving at 115 km/h (Problem 9.46) could be converted entirely into heat. What amount of water could be heated from 20 °C to 50 °C by the car's energy? 4.184 J are required to heat 1 g of water by 1 °C.
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