(a) What is the mass, in grams, of one mole of ¹²C?

검증된 단계별 안내

Understand that the mass of one mole of an element is its molar mass, which is numerically equal to the atomic mass of the element in atomic mass units (amu).

Recognize that the atomic mass of carbon-12 (\(^{12}\text{C}\)) is exactly 12 amu by definition.

Recall that one mole of any substance contains Avogadro's number of entities, which is approximately \(6.022 \times 10^{23}\) entities.

Since the atomic mass of \(^{12}\text{C}\) is 12 amu, the molar mass of \(^{12}\text{C}\) is 12 grams per mole.

Conclude that the mass of one mole of \(^{12}\text{C}\) is 12 grams.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

59s

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 numerically equivalent to the atomic or molecular weight of the substance in atomic mass units (amu). For example, the molar mass of carbon-12 (12C) is 12 g/mol, meaning one mole of carbon-12 weighs 12 grams.

Avogadro's Number

Avogadro's number, approximately 6.022 x 10²³, is the number of atoms, molecules, or particles 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 in stoichiometry and chemical reactions.

Isotopes

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses. Carbon-12 is a stable isotope of carbon with 6 protons and 6 neutrons, and it is commonly used as a standard for defining the mole and molar mass in chemistry.

(a) What is the mass, in grams, of one mole of 12C?