Stoichiometry

Question 1

the calculation in chemistry

Answer 1

stoichiometry

Question 2

the top most number

Answer 2

atomic mass

Question 3

mass of a single atom of an element

Answer 3

atomic mass

Question 4

atomic mass is determined by the number of ________________ in its nucleus

Answer 4

protons and neutrons

Question 5

unit of atomic mass

Answer 5

atomic mass unit (amu)

Question 6

weighted are mass of all the naturally occurring isotopes of an element

Answer 6

average atomic mass

Question 7

the atoms of all the same element with different numbers of neutrons, which gives them different masses

Answer 7

isotopes

Question 8

takes into the account the abundance of each isotope

Answer 8

average atomic mass

Question 9

how to calculate average atomic mass

Answer 9

1. multiply the mass of each isotope in its abundance (as a decimal)
2. add these values

Question 10

ratio of the average atomic mass of an atom to one atomic mass unit

Answer 10

relative atomic mass

Question 11

it has no unit

Answer 11

relative atomic mass

Question 12

the number of particles in one mole of a substance

Answer 12

Avogrado’s Number

Question 13

the amount of a substance that contains (6.022x10^23) particles

Answer 13

mole

Question 14

can be atoms, ions, molecules, or electrons depending on the context

Answer 14

Avogrado’s Number

Question 15

1 mole of an element, molecular compound, or ionic compound contains (6.022x10^23)

Answer 15

Avogrado’s Number

Question 16

mass in grams of one mole of a substance

Answer 16

molar mass

Question 17

The particular unit used to quantify atoms, molecules, and ions is called the ____________, the Sl unit for the amount of substance.

Answer 17

mole

Question 18

is dimensionless since the units of masses (amu) get cancelled.

Answer 18

relative atomic mass

Question 19

the _________ is defined as the amount of substance containing the same number of particles as there are atoms in exactly 12 g of carbon-12 isotope

Answer 19

SI system, the mole (mol)

Question 20

One mole of a substance is equivalent to the Avogadro’s number, 6.02 × 1023, This number is named in honor of the Italian scientist, ____________

Answer 20

Amadeo Avogadro.

Question 21

_____________ of a compound (molecular or ionic) is the mass in grams of one mole of a substance.

Answer 21

molar mass

Question 22

It is numerically equal to the sum of the masses of the elements (in amu) that make up the compound.

Answer 22

molar mass

Question 23

obtained by multiplying the number of atoms by the atomic mass of each element, and getting the sum.

Answer 23

molar mass

Question 24

used for compounds that exist as ions (e.g., NaCl). It is expressed in amu or u, and is numerically equal to the molar mass expressed in grams per mole of a substance.

Answer 24

formula mass

Question 25

is used for compounds that exist as molecules

Answer 25

Molecular mass

Question 26

___________________ are important to enable conversions between mass and moles of atoms or molecules/ions and vice versa.

Answer 26

The Avogadro’s number and molar mass