Match the descriptions (a)–(e) with the following terms: atomic weight, atomic mass, mass number, atomic number, molar mass.(a) The mass of a specific atom such as one atom of 13C (b) The quantity determined by the number of protons in an element.(c) The number of grams in 1 mol of an element (d) The number of protons and neutrons in an element (e) The weighted average of the isotopic masses of an element's naturally occurring isotopes

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Identify the term that describes the mass of a specific atom, such as one atom of \(^{13}\text{C}\). This is known as the 'atomic mass'.

Determine which term is defined by the number of protons in an element. This is referred to as the 'atomic number'.

Recognize the term that represents the number of grams in 1 mol of an element. This is called the 'molar mass'.

Find the term that describes the total number of protons and neutrons in an element. This is known as the 'mass number'.

Identify the term that refers to the weighted average of the isotopic masses of an element's naturally occurring isotopes. This is called the 'atomic weight'.

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Key Concepts

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

Atomic Mass

Atomic mass refers to the mass of a specific atom, typically measured in atomic mass units (amu). It is often represented as the mass of a single isotope, such as 13C, which accounts for the number of protons and neutrons in the nucleus of that atom.

Atomic Number

The atomic number is the number of protons found in the nucleus of an atom of an element. This number uniquely identifies the element and determines its position in the periodic table, as well as its chemical properties.

Molar Mass

Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). It is numerically equivalent to the atomic or molecular weight and is used to convert between the mass of a substance and the amount in moles, facilitating stoichiometric calculations in chemistry.

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Molar Mass Concept

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Textbook Question

(a) The unified atomic mass unit (u) is used to represent the extremely small mass of atoms. How many grams are equivalent to 1 u?

Textbook Question

The unified atomic mass unit (u) 1/12 the mass of a neutral atom of:(a) 1^H(b) 12^C (c) 14^C(d) 16^O

Textbook Question

(b) The mole is a unit used to represent a very large number of atoms. How many atoms are equivalent to 1 mol of atoms?

Textbook Question

A copper wire having a mass of 2.196 g was allowed to react with an excess of sulfur. The excess sulfur was then burned, yielding SO2 gas. The mass of the copper sulfide produced was 2.748 g.(c) Calculate the number of copper ions per cubic centimeter if the density of the copper sulfide is 5.6 g/cm3.