In 2009, a team from Northwestern University and Western Washington University reported the preparation of a new 'spongy' material composed of nickel, molybdenum, and sulfur that excels at removing mercury from water. The density of this new material is 0.20 g/cm³, and its surface area is 1242 m² per gram of material. (b) Calculate the surface area for a 10.0-mg sample of this material.

검증된 단계별 안내

Convert the mass of the sample from milligrams to grams by dividing by 1000, since there are 1000 milligrams in a gram.

Use the given surface area per gram of material, which is 1242 m^2/g, to find the total surface area for the sample.

Multiply the mass of the sample in grams by the surface area per gram to calculate the total surface area.

Ensure that the units are consistent and correctly cancel out to leave the final answer in square meters.

Review the calculation to ensure that all steps have been followed correctly and that the units are appropriate.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

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

Surface Area to Mass Ratio

The surface area to mass ratio is a critical concept in material science, particularly for porous materials. It describes how much surface area is available per unit of mass, which can significantly influence the material's reactivity and absorption capabilities. In this case, the high surface area of the spongy material allows for more effective interaction with contaminants like mercury in water.

Unit Conversion

Unit conversion is essential in chemistry for ensuring that measurements are consistent and compatible. In this problem, converting the mass of the sample from milligrams to grams is necessary to align with the surface area measurement given in square meters per gram. Understanding how to convert between different units is fundamental for accurate calculations.

Calculation of Surface Area

Calculating the surface area of a sample involves multiplying the surface area per gram by the mass of the sample in grams. This straightforward mathematical operation allows us to determine how much surface area is available for interaction with substances in the environment, which is crucial for applications like water purification.

관련 실천

교과서 질문

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교과서 질문

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교과서 질문

You are assigned the task of separating a desired granular material with a density of 3.62 g/cm³ from an undesired granular material that has a density of 2.04 g/cm³. You want to do this by shaking the mixture in a liquid in which the heavier material will fall to the bottom and the lighter material will float. A solid will float on any liquid that is more dense. Using an Internet-based source or a handbook of chemistry, find the densities of the following substances: carbon tetrachloride, hexane, benzene, and diiodomethane. Which of these liquids will serve your purpose, assuming no chemical interaction takes place between the liquid and the solids?

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교과서 질문

(c) Using the volume of a silver atom and the formula for the volume of a sphere, calculate the radius in angstroms of a silver atom.

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