Domanda del libro di testo
Determine the mass of CO2 produced by burning enough of each fuel to produce 1.00×102 kJ of heat. a. CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g) ΔH°rxn = –802.3 kJ
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Ch.7 - Thermochemistry
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217
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TOC.tableOfContents
- Ch.1 - Matter, Measurement & Problem Solving118
- Ch.2 - Atoms & Elements106
- Ch.3 - Molecules and Compounds131
- Ch.4 - Chemical Reactions and Chemical Quantities56
- Ch.5 - Introduction to Solutions and Aqueous Solutions82
- Ch.6 - Gases114
- Ch.7 - Thermochemistry96
- Ch.8 - The Quantum-Mechanical Model of the Atom60
- Ch.9 - Periodic Properties of the Elements90
- Ch.10 - Chemical Bonding I: The Lewis Model89
- Ch.11 - Chemical Bonding II: Molecular Shapes, VSEPR & MO Theory85
- Ch.12 - Liquids, Solids & Intermolecular Forces51
- Ch.13 - Solids & Modern Materials47
- Ch.14 - Solutions90
- Ch.15 - Chemical Kinetics115
- Ch.16 - Chemical Equilibrium68
- Ch.17 - Acids and Bases136
- Ch.18 - Aqueous Ionic Equilibrium153
- Ch.19 - Free Energy & Thermodynamics93
- Ch.20 - Electrochemistry106
- Ch.21 - Radioactivity & Nuclear Chemistry74
- Ch.22 - Organic Chemistry140
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217Non è quello che usi tu?Cambia libro di testo
Capitolo 7, Problema 100
In a sunny location, sunlight has a power density of about 1 kW/m2. Photovoltaic solar cells can convert this power into electricity with 15% efficiency. If a typical home uses 385 kWh of electricity per month, how many square meters of solar cells are required to meet its energy requirements? Assume that electricity can be generated from the sunlight for 8 hours per day.
Guida verificata passo dopo passo1
Calculate the total energy consumption of the home in kilowatt-hours (kWh) per day by dividing the monthly consumption by the number of days in a month.
Convert the daily energy consumption from kilowatt-hours to kilowatts by dividing by the number of hours in a day that the solar cells can generate electricity.
Determine the amount of power that needs to be generated by the solar cells by dividing the required power by the efficiency of the solar cells (15%).
Calculate the area of solar cells needed by dividing the required power by the power density of sunlight (1 kW/m^2).
Ensure the units are consistent and check the calculations to verify the area of solar cells required.
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Power Density
Power density refers to the amount of power (energy per unit time) received per unit area, typically measured in watts per square meter (W/m²). In this context, a power density of 1 kW/m² indicates that each square meter of solar panel can receive 1 kilowatt of solar energy under optimal conditions. Understanding power density is crucial for calculating the total energy available from sunlight for solar energy applications.
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04:42
Power and Root Functions Example
Efficiency of Solar Cells
The efficiency of solar cells is the ratio of the electrical output to the solar energy input, expressed as a percentage. In this case, a 15% efficiency means that only 15% of the solar energy hitting the solar cells is converted into usable electricity. This concept is vital for determining how much solar panel area is needed to generate a specific amount of electricity, as higher efficiency results in less area required.
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01:21The Electrolytic Cell
Energy Consumption and Conversion
Energy consumption refers to the total amount of energy used by a household, measured in kilowatt-hours (kWh). To meet the energy needs of a home using 385 kWh per month, one must convert this monthly requirement into a daily average and then into the equivalent solar energy needed, factoring in the hours of sunlight available. This conversion is essential for calculating the area of solar cells required to meet the household's energy demands.
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Percorso guidato
01:56Conversion Factors
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Domanda del libro di testo
LP gas burns according to the exothermic reaction: C3H8( g) + 5 O2( g)¡3 CO2( g) + 4 H2O( g) ΔH °rxn = -2044 kJ What mass of LP gas is necessary to heat 2.50 L of water from room temperature (25.0 °C) to boiling (100.0 °C)? Assume that during heating, 15% of the heat emitted by the LP gas combustion goes to heat the water. The rest is lost as heat to the surroundings. (Assume a density of 1.00 g/mL for water.)
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Domanda del libro di testo
The kinetic energy of a rolling billiard ball is given by KE = 1/2 mv2. Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial speed of 4.5 m/s. As it travels, it loses some of its energy as heat. The ball slows down to 3.8 m/s and then collides head-on with a second billiard ball of equal mass. The first billiard ball completely stops and the second one rolls away with a velocity of 3.8 m/s. Assume the first billiard ball is the system. Calculate q.
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Domanda del libro di testo
Methanol (CH3OH) has been suggested as a fuel to replace gasoline. Find ΔH°rxn, and determine the mass of carbon dioxide emitted per kJ of heat produced. Use the information from the previous exercise to calculate the same quantity for octane, C8H18. How does methanol compare to octane with respect to global warming?
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