Domanda del libro di testo
A metal is thought to be titanium or aluminum. When 4.7 g of the metal absorbs 11 J, its temperature rises by 4.5 °C.
b. Would you identify the metal as titanium or aluminum (see TABLE 3.11)?
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Ch.3 Matter and Energy
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249
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TOC.tableOfContents
- Ch.1 Chemistry in Our Lives19
- Ch.2 Chemistry and Measurements80
- Ch.3 Matter and Energy53
- Ch.4 Atoms and Elements58
- Ch.5 Nuclear Chemistry42
- Ch.6 Ionic and Molecular Compounds57
- Ch.7 Chemical Quantities and Reactions38
- Ch.8 Gases30
- Ch.9 Solutions50
- Ch.10 Acids and Bases and Equilibrium64
- Ch.11 Introduction to Organic Chemistry: Hydrocarbons77
- Ch.12 Alcohols, Thiols, Ethers, Aldehydes, and Ketones82
- Ch.13 Carbohydrates54
- Ch.14 Carboxylic Acids, Esters, Amines, and Amides91
- Ch.15 Lipids61
- Ch.16 Amino Acids, Proteins, and Enzymes84
- Ch.17 Nucleic Acids and Protein Synthesis86
- Ch.18 Metabolic Pathways and ATP Production73
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249Non è quello che usi tu?Cambia libro di testo
Capitolo 3, Problema 101b
In a large building, oil is used in a steam boiler heating system. The combustion of 1.0 lb of oil provides 2.4 × 107 J.
b. How many kilograms of oil are needed to change 150 kg of water to steam at 100 °C?
Guida verificata passo dopo passo1
Determine the amount of energy required to convert 150 kg of water to steam at 100 °C. Use the formula for heat energy: , where is the mass of water (150 kg) and is the heat of vaporization of water (2.26 × 10⁶ J/kg).
Calculate the total energy required by substituting the values into the formula: . This will give the energy in joules needed to convert the water to steam.
Determine how much energy is provided by 1.0 lb of oil. From the problem, 1.0 lb of oil provides 2.4 × 10⁷ J. Convert this energy to the equivalent in kilograms of oil by using the conversion factor: 1 lb = 0.453592 kg.
Calculate the mass of oil required to provide the total energy needed. Use the relationship: , where is the total energy required (from step 2) and is the energy provided per kilogram of oil (from step 3).
Perform the division to find the mass of oil in kilograms. This will give the amount of oil needed to convert 150 kg of water to steam at 100 °C.
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Heat of Vaporization
The heat of vaporization is the amount of energy required to convert a unit mass of a substance from liquid to gas at its boiling point. For water, this value is approximately 2.26 x 10⁶ J/kg. Understanding this concept is crucial for calculating how much energy is needed to convert 150 kg of water to steam.
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Percorso guidato
02:19
Heat Capacity
Energy Conversion
Energy conversion refers to the process of changing energy from one form to another. In this context, the energy produced from burning oil is converted into thermal energy to heat water. Knowing the energy content of the oil (2.4 x 10⁷ J per pound) allows us to determine how much oil is needed to provide the required energy for vaporizing the water.
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Percorso guidato
03:45Conversion Factors (Simplified) Example 2
Mass-Energy Relationship
The mass-energy relationship is a principle that relates mass to energy, often expressed through the equation E=mc². In practical terms, this concept helps in understanding how the mass of oil needed can be calculated based on the energy required to heat and vaporize water. This relationship is essential for converting the energy requirements into a mass of oil needed for the heating process.
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Percorso guidato
04:56Logarithmic Relationships
Pratica correlata
Domanda del libro di testo
A 45-g piece of ice at 0.0 °C is added to a sample of water at 8.0 °C. All of the ice melts and the temperature of the water decreases to 0.0 °C. How many grams of water were in the sample?
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Domanda del libro di testo
A metal is thought to be copper or gold. When 18 g of the metal absorbs 58 cal, its temperature rises by 35 °C.
a. What is the specific heat, in cal/g °C, of the metal?
2315
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Domanda del libro di testo
When a 0.66-g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 370 g of water from 22.7 °C to 38.8 °C. What is the energy value for the olive oil in kcal/g?
2836
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Domanda del libro di testo
In a large building, oil is used in a steam boiler heating system. The combustion of 1.0 lb of oil provides 2.4 × 107 J.
a. How many kilograms of oil are needed to heat 150 kg of water from 22 °C to 100 °C?
935
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Domanda del libro di testo
When 1.0 g of gasoline burns, it releases 11 kcal. The density of gasoline is 0.74 g/mL.
b. If a television requires 150 kJ/h to run, how many hours can the television run on the energy provided by 1.0 gal of gasoline?
1007
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