Question

Define the following:
a) Relative atomic mass of an element
b) Relative molecular mass of a substance
c) Average atomic mass
d) Gram atomic mass of an element

e) Gram molecular mass of an substance
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Answer 1

Answer:

a) The relative atomic mass of an element is the average mass of its atoms, compared to 1/12th the mass of a carbon-12 atom. The relative atomic mass, A r, of an element is calculated from: the mass numbers of its isotopes. the abundance of these isotopes.

b) The relative molecular mass/relative formula mass is defined as the sum of all the individual atomic masses of ALL the atoms in the formula (Mr). e.g. for ionic compounds e.g. NaCl = 23 + 35.5 58.5) or molecular mass for covalent elements or compounds

c) The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).

d) Gram atomic mass → The quantity of an element whose mass expressed in grams is numerically equal to its atomic mass is known as gram atomic mass.

e) Gram molecular mass refers to the mass of a molecules in one mole of molecules of that substance. It is equal to the gram molecular weight of that element. Oxygen exists as a diatomic molecule (O2); therefore, gram molecular mass of oxygen is 32 grams.

Explanation:

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Answer 2

Answer:

a) relative atomic mass or atomic weight is a dimensionless physical quantity defined as the ratio of the average mass of atoms

b) relative molecular mass is the ratio of the mass of a molecule to the unified atomic mass unit

c) the average atomic mass of an element is the weighted average mass of the atoms in a naturally occuring sample of the element

d) gram atomic mass is the mass in grams of one mole of atoms in a monatomic chemical element

e) molar mass is defined as the mass in grams of one mole of substance

Explanation:

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