Mole Concepts

Butihen Monique Charlene · 6問 · 2年前

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counting unit of chemistry.

Mole

Mole is a Latin word which means “____” or a “______” and the SI symbol is mol.

heap, huge pile

One mole is the number of atoms in exactly __ grams of the isotope of ___C.

12 and 12C

It is also defined as the amount of substance containing the Avogadro’s number in any kind of chemical unit.

Mole

The number 6.02 x 10²³ is known as the

Avogadro’s number

Avogadro's Number is named after 1. ________ the reason why the number is so large is that the masses of atoms are so ____

1. Amedeo Avogadro 2. small

____ of an element is the weighted average value of the masses of the isotopes in a naturally occurring sample of the element.

atomic mass

The atomic masses of all elements can be found in the ______.

periodic table of elements

The unit used for the mass of atom is _____ which stands for atomic mass unit.

amu,

The _____ of a substance is the sum of the atomic masses of all the atoms indicated in the formula of a substance.

formula mass

Formula mass cannot be determined without considering the _______ of the individual elements.

molar masses

The mass in grams of one mole of substance is called ______. Each element has its own unique _______.

molar mass

Finding molar mass starts with ______.

units of grams per mole (g/mol)

When calculating ______ of a chemical compound, it states how many grams are in one mole of that substance.

molar mass

The number of grams in a molar mass of an element is the same as the ______.

atomic mass

The formula mass of a compound may also be called _______

molecular mass

Specifically, if the involved substance is a ______, the formula mass of that compound may also be called molecular mass

molecular substance

One mole of certain elements implies two things: the _______ of the element and the _______ which is the same for all elements.

molar mass and Avogadro’s number

____ are made up of two or more elements.

Compounds

There are two different ways to describe the composition of a compound: in terms of the number of its _________ and in terms of the _________ of its elements.

constituent atoms, percentage

When showing the constituent atoms of a molecule, you can either: (a) show the _______, or (b) show the _________

chemical formula, empirical formula

which merely shows their relative amounts in a substance.

empirical formula

which shows the real number of atoms in the molecule,

chemical formula

the percentage of the total mass of the compound that is due to that component

Percentage Composition

shorthand method of representing the composition of a substance

Chemical Formula

the formula of a substance written with the lowest integer subscripts

Empirical Formula,

Law of Conservation of Mass The total mass of _____ is equal to the total mass of ______.

reactants, products

It says that the amount of matter in the universe is constant.

Law of Conservation of Mass

The law of conservation of mass was proposed by ___________, who is considered as the Father of Modern Chemistry.

Antoine Laurent Lavoisier

_________, the branch of chemistry that deals with the numerical relationships of the elements and compounds and the mathematical proportions of reactants and products in a chemical reaction.

Stoichiometry

Chemical formulas can be divided into (3)

empirical formula, molecular formula and structural formula.

The ________ a of a compound is a multiple of its empirical formula.

Molecular Formula

Molecular Formula can be obtained by multiplying the subscripts of the empirical formula by a number which corresponds to the ______ of the molar mass of the compound and the mass of _________.

ratio, one empirical unit

It indicates the kind of atoms in the compound formed and the simplest whole number ratio of the atoms in the compound.

empirical formula

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