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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 95
3장, 문제 95

From the given empirical formula and molar mass, find the molecular formula of each compound. a. C6H7N, 186.24 g/mol

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Identify the empirical formula: C_6H_7N.
Calculate the molar mass of the empirical formula. Use the atomic masses: C = 12.01 g/mol, H = 1.01 g/mol, N = 14.01 g/mol.
Calculate the total molar mass of the empirical formula: (6 * 12.01) + (7 * 1.01) + (1 * 14.01).
Divide the given molar mass of the compound (186.24 g/mol) by the molar mass of the empirical formula to find the ratio (n).
Multiply the subscripts in the empirical formula by the ratio (n) to find the molecular formula.

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주요 개념

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Empirical Formula

The empirical formula represents the simplest whole-number ratio of atoms of each element in a compound. It provides essential information about the composition of the compound but does not indicate the actual number of atoms present in a molecule. For example, the empirical formula for glucose (C6H12O6) is CH2O, reflecting the ratio of carbon, hydrogen, and oxygen.
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가이드 코스
02:26
Empirical vs Molecular Formula

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 atoms in the molecular formula. Knowing the molar mass is crucial for converting between grams and moles, and it helps in determining the molecular formula from the empirical formula when combined with the empirical formula's mass.
추천 영상:
가이드 코스
02:11
Molar Mass Concept

Molecular Formula

The molecular formula indicates the actual number of atoms of each element in a molecule of a compound. It can be derived from the empirical formula by multiplying the subscripts by a whole number, which is determined by the ratio of the compound's molar mass to the empirical formula mass. For instance, if the empirical formula is CH2 and the molar mass is 86 g/mol, the molecular formula would be C6H12.
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가이드 코스
02:08
Determining Molecular Formulas
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