pipc topic 3: stoichiometry

1 amu = ?g

1.6606 × 10 power -24

what is the difference between molecular weight and formula weight

mw applies to molecular compounds fw applies to molecular and ionic compounds

what is the formula for percentage composition?

weight of element / weight of compound x 100%

what is the formula for Avogadro’s number?

6.02 × 10 power -23

what is the formula of molar mass

mass / number of moles

how to convert mass to number of moles?

mass / molar mass

how to convert number of moles to particles?

number of moles x NA

how to convert particles to number of moles?

particles / NA

how to convert number of moles to mass?

number of moles x molar mass

how to find molecular formula?

(EF)n

how to find n?

molecular weight / empirical formula weight

if 0.5 how to convert to whole number?

x2

if 0.33 how to convert to whole number?

x3

if 0.67 how to convert to whole number?

x3

if 0.25 how to convert to whole number?

x4

if 0.75 how to convert to whole number?

x4

balancing equations: which molecules are aqueous?

soluble salt in water

acid/base in water

balancing equations: which molecules are solid?

insoluble salt / precipitate

metal

balancing equations: which molecules are gas?

common gases CO2 O2 H2

balancing equations: which molecules are liquid

pure water

what is a limiting reactant (LR)?

the reactant that is completely consumed in a reaction

how to calculate theoretical yield?

moles x molar mass

how to calculate % yield?

actual yield / theoretical yield x 100%