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Ch.3 - Molecules and Compounds
Tro - Chemistry: A Molecular Approach 5th Edition
Tro5th EditionChemistry: A Molecular ApproachISBN: 9780134874371당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Tro 5th EditionCh.3 - Molecules and Compounds문제 115
3장, 문제 115

A metal (M) forms a compound with the formula MCl3. If the compound contains 65.57% Cl by mass, what is the identity of the metal?

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1
Calculate the molar mass of Cl in the compound MCl_3. Since there are 3 Cl atoms, multiply the atomic mass of Cl (approximately 35.45 g/mol) by 3.
Let the molar mass of the metal M be x g/mol. The molar mass of the compound MCl_3 is then x + 3(35.45) g/mol.
Set up the equation for the mass percentage of Cl: (3(35.45) / (x + 3(35.45))) * 100% = 65.57%.
Solve the equation for x to find the molar mass of the metal M.
Compare the calculated molar mass of M to known molar masses of elements to identify the metal.

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주요 개념

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

Molar Mass and Percent Composition

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole. Percent composition refers to the percentage by mass of each element in a compound. To find the identity of the metal in MCl3, we can use the given percent composition of chlorine to determine the molar mass of the entire compound and subsequently the molar mass of the metal.
추천 영상:
가이드 코스
00:38
Mass Percent Calculation

Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions based on the conservation of mass. In this context, it allows us to relate the mass of chlorine in MCl3 to the mass of the metal. By using the formula and the known mass percentages, we can set up equations to solve for the molar mass of the metal.
추천 영상:
가이드 코스
01:16
Stoichiometry Concept

Periodic Table and Element Identification

The periodic table organizes elements based on their atomic number and properties. Once we calculate the molar mass of the metal from the stoichiometric calculations, we can compare it to known atomic masses of elements in the periodic table to identify the metal. This step is crucial for determining which metal corresponds to the calculated molar mass.
추천 영상:
가이드 코스
04:01
Periodic Table History
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