3 Stochiometry

Question 1

molecular formula

Answer 1

defines the number of atoms of each element in one molecule of a compound.
- shows actual number of atoms in a molecule

Question 2

empirical formula

Answer 2

the simplest whole number ratio of the different atoms or ions in a compound

Question 3

relative atomic mass

Answer 3

average mass of the isotopes of an element compared to 1/12th the mass of an 12C atom

Question 4

relative molecular mass

Answer 4

sum of the relative atomic masses

Question 5

relative formula mass

Answer 5

sum of relative atomic masses, but in ionic compounds

Question 6

concentration/molarity

Answer 6

mol/vol or g/vol

Question 7

mole

Answer 7

unit amount of substance and that one mole contains 6.02x10^23

Question 8

mole formula

Answer 8

mass / molar mass

Question 9

molar gas volume at room temperature and pressure

Answer 9

24dm^3

Question 10

Moles of gas formula

Answer 10

vol/24

Question 11

titration

Answer 11

a way of determining the concentration of an acid/base by determining the precise volume of acid/base that will completely react with it

Question 12

percentage yield

Answer 12

actual yield/predicted yield x 100

Question 13

percentage purity

Answer 13

mass of pure product/mass of product x 100

Question 14

atom economy

Answer 14

relative formula mass of desired products/sum of relative formula mass of all reactants