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Ch.9 - Thermochemistry: Chemical Energy
McMurry - Chemistry 8th Edition
McMurry8th EditionChemistryISBN: 9781292336145당신이 사용하는 게 아니라요?교과서 변경
모든 교과서McMurry 8th EditionCh.9 - Thermochemistry: Chemical Energy문제 80
9장, 문제 80

Assuming that Coca-Cola has the saem specific heat as water [4.18 J/(g C)], calculate the amount of heat in kilojoules transferred when one can (about 350 g) is cooled from 25 C to 3 C.

검증된 단계별 안내
1
Identify the mass of the Coca-Cola, which is given as 350 g.
Note the initial and final temperatures of the Coca-Cola, which are 25°C and 3°C, respectively.
Calculate the change in temperature (ΔT) by subtracting the final temperature from the initial temperature: ΔT = 25°C - 3°C.
Use the formula for heat transfer, Q = m * c * ΔT, where m is the mass, c is the specific heat capacity (4.18 J/(g°C) for water, and assumed for Coca-Cola), and ΔT is the change in temperature.
Convert the heat transfer from joules to kilojoules by dividing by 1000, since 1 kilojoule = 1000 joules.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
1m

주요 개념

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

Specific Heat Capacity

Specific heat capacity is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius. It is a crucial property that determines how much energy is needed to change the temperature of a material. In this case, Coca-Cola is assumed to have the same specific heat as water, which is 4.18 J/(g·°C), allowing for straightforward calculations of heat transfer.
추천 영상:
가이드 코스
02:19
Heat Capacity

Heat Transfer Calculation

The heat transfer (q) can be calculated using the formula q = m × c × ΔT, where m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature. This formula allows us to quantify the energy exchanged during temperature changes, which is essential for solving the problem of cooling Coca-Cola from 25°C to 3°C.
추천 영상:
가이드 코스
01:05
Calculations with Heating and Cooling Curves

Units of Energy

Energy is often measured in joules (J) or kilojoules (kJ), where 1 kJ equals 1000 J. Understanding these units is important for converting the calculated heat transfer into the desired format. In this problem, the final answer should be expressed in kilojoules, necessitating a conversion from joules if the calculation yields a value in that unit.
추천 영상:
가이드 코스
02:13
SI Units
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