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Ch.14 - Solutions
Tro - Chemistry: A Molecular Approach 5th Edition
Tro5th EditionChemistry: A Molecular ApproachISBN: 9780134874371당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Tro 5th EditionCh.14 - Solutions문제 63
14장, 문제 63

For a solution prepared by dissolving 28.4 g of glucose (C6H12O6) in 355 g of water with a final volume of 378 mL, calculate the concentration in each unit: a. molarity, b. molality, c. percent by mass, d. mole fraction, e. mole percent.

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1
Calculate the molar mass of glucose (C_6H_{12}O_6) by adding the atomic masses of all atoms in the formula.
Convert the mass of glucose (28.4 g) to moles using its molar mass.
For molarity (a), divide the moles of glucose by the volume of the solution in liters (convert 378 mL to liters).
For molality (b), divide the moles of glucose by the mass of the solvent (water) in kilograms (convert 355 g to kg).
For percent by mass (c), divide the mass of glucose by the total mass of the solution (glucose + water) and multiply by 100 to get the percentage.

주요 개념

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

Molarity

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is calculated using the formula M = moles of solute / volume of solution in liters. To find the moles of glucose, divide its mass by its molar mass (180.18 g/mol). This concept is essential for understanding how solute concentration affects chemical reactions and properties.
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가이드 코스
01:13
Molarity

Molality

Molality is another concentration measure, defined as the number of moles of solute per kilogram of solvent. It is calculated using the formula m = moles of solute / mass of solvent in kg. Unlike molarity, molality is temperature-independent, making it useful in scenarios where temperature fluctuations may affect volume. This concept is crucial for calculations involving colligative properties.
추천 영상:
가이드 코스
00:40
Molality

Percent by Mass

Percent by mass (or mass percent) is a way to express the concentration of a component in a mixture, calculated as the mass of the solute divided by the total mass of the solution, multiplied by 100. This concept helps in understanding the composition of solutions and is particularly useful in fields like pharmaceuticals and food science, where precise concentrations are critical.
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가이드 코스
00:38
Mass Percent Calculation
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