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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 64c
14장, 문제 64c

A solution is prepared by dissolving 20.2 mL of methanol (CH3OH) in 100.0 mL of water at 25 °C. The final volume of the solution is 118 mL. The densities of methanol and water at this temperature are 0.782 g/mL and 1.00 g/mL, respectively. For this solution, calculate the concentration in each unit. c. percent by mass

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1
Calculate the mass of methanol using its volume and density. Use the formula: mass = volume × density.
Calculate the mass of water using its volume and density. Use the formula: mass = volume × density.
Add the masses of methanol and water to find the total mass of the solution.
Calculate the percent by mass of methanol in the solution using the formula: percent by mass = (mass of solute / total mass of solution) × 100%.
Express the result as a percentage to find the percent by mass of methanol in the solution.

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주요 개념

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Concentration Units

Concentration can be expressed in various units, including molarity, percent by mass, and volume/volume percent. Percent by mass is calculated by taking the mass of the solute and dividing it by the total mass of the solution, then multiplying by 100. Understanding these units is essential for accurately describing the composition of a solution.
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가이드 코스
02:13
SI Units

Density and Mass Calculation

Density is defined as mass per unit volume and is crucial for converting volumes of liquids into masses. For methanol and water, their respective densities allow us to calculate the mass of each component in the solution. This mass is necessary for determining the percent by mass of the solute in the final solution.
추천 영상:
가이드 코스
03:12
Molar Mass Calculation Example

Final Volume of Solution

The final volume of a solution is the total volume after mixing the solute and solvent. In this case, the final volume is given as 118 mL, which is important for calculating the total mass of the solution. This total mass, combined with the mass of the solute, is used to find the percent by mass concentration.
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가이드 코스
02:35
Constant-Volume Calorimetry
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