Label the following statements as true or false. (a) The atomic weight and the atomic number of an element have the same numerical value. (b) The molar mass in grams for an element and the atomic weight have the same numerical value.

Name: Chemistry
Author: McMurry
ISBN: 9781292336145

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Step 1: Understand the concept of atomic number and atomic weight. The atomic number is the number of protons in an atom's nucleus, while the atomic weight (or atomic mass) is the weighted average mass of an atom of an element based on the abundance of its isotopes.

Step 2: Analyze statement (a). Compare the definitions of atomic number and atomic weight. Consider whether it is possible for these two values to be numerically the same for any element.

Step 3: Understand the concept of molar mass. The molar mass of an element is the mass of one mole of its atoms, usually expressed in grams per mole (g/mol).

Step 4: Analyze statement (b). Compare the definitions of molar mass and atomic weight. Consider how the atomic weight of an element, expressed in atomic mass units (amu), relates to its molar mass in grams per mole.

Step 5: Conclude the truthfulness of each statement based on the analysis of the definitions and relationships between atomic number, atomic weight, and molar mass.

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Atomic Weight vs. Atomic Number

The atomic weight of an element is the weighted average mass of its isotopes, measured in atomic mass units (amu), while the atomic number is the number of protons in the nucleus of an atom, which defines the element. These two values are not the same; for example, carbon has an atomic number of 6 but an atomic weight of approximately 12.01 amu.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). For elements, the molar mass numerically equals the atomic weight in amu, meaning that the molar mass of an element in grams is the same as its atomic weight, allowing for direct conversion between the two units.

True/False Statements in Chemistry

In chemistry, evaluating statements as true or false often requires a clear understanding of definitions and relationships between concepts. For instance, recognizing that atomic weight and atomic number are distinct helps in determining the truth of statements regarding their numerical values, while understanding molar mass allows for accurate comparisons with atomic weight.