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Ch.3 - Chemical Reactions and Reaction Stoichiometry
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 14th EditionCh.3 - Chemical Reactions and Reaction Stoichiometry문제 25a
3장, 문제 25a

Calculate the percentage by mass of oxygen in the following compounds: (a) vanillin, C8H8O3

검증된 단계별 안내
1
Determine the molar mass of vanillin, \( C_8H_8O_3 \), by adding the atomic masses of all the atoms in the formula. Use the periodic table to find the atomic masses: Carbon (C) is approximately 12.01 g/mol, Hydrogen (H) is approximately 1.01 g/mol, and Oxygen (O) is approximately 16.00 g/mol.
Calculate the total mass of oxygen in the compound by multiplying the number of oxygen atoms (3) by the atomic mass of oxygen (16.00 g/mol).
Add the masses of all the atoms in the compound to find the total molar mass of vanillin.
Use the formula for percentage by mass: \( \text{Percentage by mass of oxygen} = \left( \frac{\text{Total mass of oxygen}}{\text{Molar mass of vanillin}} \right) \times 100 \% \).
Substitute the values obtained in the previous steps into the formula to calculate the percentage by mass of oxygen in vanillin.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
2m

주요 개념

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

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a chemical formula. For example, in vanillin (C8H8O3), the molar mass is determined by adding the contributions from carbon, hydrogen, and oxygen atoms based on their respective quantities.
추천 영상:
가이드 코스
02:11
Molar Mass Concept

Percentage by Mass

Percentage by mass is a way to express the concentration of a particular element in a compound. It is calculated by dividing the mass of the element by the total mass of the compound and then multiplying by 100. This calculation helps in understanding the composition of compounds and is essential for stoichiometric calculations in chemistry.
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 vanillin (C8H8O3), the formula indicates there are 8 carbon atoms, 8 hydrogen atoms, and 3 oxygen atoms. This information is crucial for calculating the molar mass and subsequently the percentage by mass of each element in the compound.
추천 영상:
가이드 코스
03:13
Intepreting the Band of Stability
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