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Ch.3 - Mass Relationships in Chemical Reactions
McMurry - Chemistry 8th Edition
McMurry8th EditionChemistryISBN: 9781292336145당신이 사용하는 게 아니라요?교과서 변경
모든 교과서McMurry 8th EditionCh.3 - Mass Relationships in Chemical Reactions문제 87a
3장, 문제 87a

Calculate the mass percent composition of each of the following substances. (a) Malachite, a copper-containing mineral: Cu2(OH)2CO3

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1
Identify the chemical formula of malachite: Cu_2(OH)_2CO_3.
Calculate the molar mass of each element in the compound: Cu, O, H, and C.
Determine the total molar mass of the compound by summing the molar masses of all atoms in the formula.
Calculate the mass percent of each element by dividing the total mass of each element in the formula by the total molar mass of the compound and multiplying by 100%.
Express the mass percent composition for each element in the compound.

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3m

주요 개념

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

Molar Mass Calculation

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). To calculate the molar mass of a compound, you sum the atomic masses of all the atoms in its chemical formula. For malachite, Cu₂(OH)₂CO₃, you would calculate the molar mass by adding the contributions from copper (Cu), oxygen (O), hydrogen (H), and carbon (C) based on their respective quantities in the formula.
추천 영상:
가이드 코스
03:12
Molar Mass Calculation Example

Mass Percent Composition

Mass percent composition refers to the percentage by mass of each element in a compound. It is calculated by dividing the mass of each element in one mole of the compound by the total molar mass of the compound, then multiplying by 100. This concept is essential for understanding the distribution of elements within a compound and is particularly useful in stoichiometry and chemical analysis.
추천 영상:
가이드 코스
00:38
Mass Percent Calculation

Chemical Formula Interpretation

Interpreting a chemical formula involves understanding the types and numbers of atoms present in a compound. In the case of malachite, Cu₂(OH)₂CO₃, the formula indicates that there are two copper atoms, two hydroxide groups (OH), one carbonate group (CO₃), and the associated oxygen and hydrogen atoms. This interpretation is crucial for accurately calculating both the molar mass and the mass percent composition of the compound.
추천 영상:
가이드 코스
03:13
Intepreting the Band of Stability
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