How many grams are in a mole of each of the following substances? (c) Hg

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Identify the substance in question, which is mercury (Hg).

Determine the atomic mass of mercury (Hg) from the periodic table. The atomic mass is typically given in atomic mass units (amu) or grams per mole (g/mol).

Understand that the atomic mass of an element in grams per mole is numerically equal to the mass of one mole of that element.

Recognize that the atomic mass of mercury (Hg) is approximately 200.59 g/mol.

Conclude that one mole of mercury (Hg) weighs 200.59 grams.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

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 or formula unit. For example, the molar mass of mercury (Hg) is approximately 200.59 g/mol, which indicates that one mole of mercury weighs about 200.59 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. Understanding this concept is essential for relating the mass of a substance to the number of moles present.

Elemental Composition

Elemental composition refers to the types and amounts of elements that make up a substance. In the case of mercury (Hg), it is a pure element consisting solely of mercury atoms. Knowing the elemental composition is crucial for determining the molar mass and understanding the properties of the substance in chemical reactions.

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