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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 92a
3장, 문제 92a

(a) One molecule of the antibiotic penicillin G has a mass of 5.342×10-21 g. What is the molar mass of penicillin G?

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1
Understand that the molar mass of a substance is the mass of one mole of its molecules, expressed in grams per mole (g/mol).
Recall that Avogadro's number, approximately 6.022 × 10^23, is the number of molecules in one mole of a substance.
To find the molar mass, multiply the mass of a single molecule by Avogadro's number. This will convert the mass from grams per molecule to grams per mole.
Set up the calculation: Molar mass = (mass of one molecule) × (Avogadro's number).
Substitute the given values into the equation: Molar mass = (5.342 × 10^-21 g/molecule) × (6.022 × 10^23 molecules/mol).

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주요 개념

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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 molecule. For example, the molar mass of water (H2O) is approximately 18.02 g/mol, derived from 2 hydrogen atoms and 1 oxygen atom.
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Molar Mass Concept

Avogadro's Number

Avogadro's number, approximately 6.022 × 10²³, is the number of particles (atoms, molecules, or ions) in one mole of a substance. This constant allows chemists to convert between the number of particles and the amount of substance in moles, facilitating calculations involving chemical reactions and stoichiometry.
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Avogadro's Law

Unit Conversion

Unit conversion is the process of converting a quantity expressed in one set of units to another set of units. In chemistry, this often involves converting mass to moles using molar mass or converting between grams and kilograms. Understanding how to perform these conversions is essential for solving problems related to chemical quantities.
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Conversion Factors
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The fluoride ion reacts with water to produce HF. (a) Write out the chemical equation for this reaction.
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교과서 질문

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(b) Hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecule and contains 0.340% iron by mass. Calculate the molar mass of hemoglobin.

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