Ch.7 - Thermochemistry

Tro - Chemistry: A Molecular Approach 6th Edition

Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217당신이 사용하는 게 아니라요?교과서 변경

Tro 6th Edition

Ch.7 - Thermochemistry

문제 36d

7장, 문제 36d

A particular frost-free refrigerator uses about 705 kWh of electrical energy per year. Express this amount of energy in each unit. d. Cal

검증된 단계별 안내

Identify the conversion factor between kilowatt-hours (kWh) and calories (Cal). Note that 1 kWh = 3.6 x 10^6 J and 1 Cal = 4184 J.

Convert the energy from kilowatt-hours to joules using the conversion factor: Energy (J) = Energy (kWh) x 3.6 x 10^6 J/kWh.

Use the conversion factor between joules and calories to convert the energy from joules to calories: Energy (Cal) = Energy (J) / 4184 J/Cal.

Perform the calculation to find the energy in calories.

Ensure the units are consistent and the conversion is correct by checking each step.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

도움이 되었나요?

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Energy Units

Energy can be measured in various units, including kilowatt-hours (kWh) and calories (Cal). A kilowatt-hour is the amount of energy consumed when a device uses one kilowatt of power for one hour. Understanding how to convert between these units is essential for solving energy-related problems.

Conversion Factors

To convert energy from one unit to another, specific conversion factors are used. For instance, 1 kWh is equivalent to approximately 860 Cal. Knowing these conversion factors allows for accurate calculations when expressing energy in different units.

Thermodynamics

Thermodynamics is the branch of physics that deals with heat and energy transfer. In the context of refrigerators, it is important to understand how energy is consumed and transformed, as this relates to the efficiency and operation of the appliance. This knowledge aids in comprehending the significance of energy consumption figures.

관련 실천

교과서 질문

Convert between energy units. c. 4.99 × 10³ kJ to kWh

Identify each energy exchange as primarily heat or work and determine whether the sign of ΔE is positive or negative for the system. a. Sweat evaporates from skin, cooling the skin. (The evaporating sweat is the system.) b. A balloon expands against an external pressure. (The contents of the balloon is the system.) c. An aqueous chemical reaction mixture is warmed with an external flame. (The reaction mixture is the system.) Identify energy exchanges as primarily heat or work. Determine whether the sign of E is positive or negative for the system.

1287

views

교과서 질문

Suppose that a person eats 2105 Calories per day. Convert this amount of energy into each unit. c. kWh

교과서 질문

Which statement is true of the internal energy of a system and its surroundings during an energy exchange with a negative ΔE_sys? a. The internal energy of the system increases and the internal energy of the surroundings decreases. b. The internal energy of both the system and the surroundings increases. c. The internal energy of both the system and the surroundings decreases. d. The internal energy of the system decreases and the internal energy of the surroundings increases.

2278

views

comments