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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 44b
3장, 문제 44b

At least 25 mg of tetrahydrocannabinol (THC), the active ingredient in marijuana, is required to produce intoxication. The molecular formula of THC is C21H30O2. How many molecules?

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1
Identify the given information: 25 mg of THC and its molecular formula C_{21}H_{30}O_2.
Convert the mass of THC from milligrams to grams by dividing by 1000.
Calculate the molar mass of THC by adding the atomic masses of all the atoms in the molecular formula: (21 \(\times\) \(\text{atomic mass of C}\)) + (30 \(\times\) \(\text{atomic mass of H}\)) + (2 \(\times\) \(\text{atomic mass of O}\)).
Convert the mass of THC in grams to moles by dividing by the molar mass of THC.
Use Avogadro's number (6.022 \(\times\) 10^{23} molecules/mol) to convert the moles of THC to the number of molecules by multiplying the moles by Avogadro's number.

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

주요 개념

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

Molecular Formula

A molecular formula represents the number and type of atoms in a molecule. For THC, the molecular formula C21H30O2 indicates it contains 21 carbon atoms, 30 hydrogen atoms, and 2 oxygen atoms. Understanding molecular formulas is essential for calculating the number of molecules in a given mass.
추천 영상:
가이드 코스
02:08
Determining Molecular Formulas

Molar Mass

The molar mass of a compound is the mass of one mole of its molecules, typically expressed in grams per mole (g/mol). For THC, the molar mass can be calculated by summing the atomic masses of all atoms in its molecular formula. This value is crucial for converting between mass and the number of molecules using Avogadro's number.
추천 영상:
가이드 코스
02:11
Molar Mass Concept

Avogadro's Number

Avogadro's number, approximately 6.022 x 10^23, is the number of molecules in one mole of a substance. This constant allows chemists to relate the mass of a substance to the number of molecules it contains. In the context of the question, it is used to determine how many molecules correspond to the specified mass of THC.
추천 영상:
가이드 코스
02:11
Avogadro's Law
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