1 mole =
particles
: Avogadro’s number
Particles = molecules
Molar mass of each element can be
found on the periodic table. The unit is
in grams/mol or g/mol.
Calculate the molar mass of mercury
(II) sulfate.
p.326. #31, A sample of sodium sulfite (Na2SO3) has a mass of 2.25 g.
(a) How many Na+ ions are present? (b) How many SO3-2 ions are
present? (c ) What is the mass in grams of one formula unit of Na2SO3?
• #33, A sample of ethanol (C 2H5OH) has a mass of 45.6 g. (a) How
many hydrogen atoms does the sample contain?
• Which has the larger percent by mass of sulfur, H 2SO3 or H2S2O8?
• Percent formula =
• Empirical formula is the __________ ratio of elements in a
compound.
• Ionic compound: Is the empirical formula the correct formula?
(please do not answer and let the rest of the class some time to
think)
•
Molecular compound: is the empirical compound the correct
formula?
• The relationship of molecular formula and empirical formula
• Determine the molecular formula for ibuprofen. Analysis of
ibuprofen yields a molar mass of 206 g/mol and a percent
composition of 75.7% C, 8.80% H and 15.5% O.
• Combustion reaction: combustion, burns
• You need hydrocarbon O 2
• The process produces CO 2 and H2O, both in __________ state
• Write the balanced equation of the combustion of liquid C 6H13OH
• Synthesis: synthesis, combination, composition
• Simple → complex or elements → compound
• Write the balanced synthesis equation of magnesium bromide
• Decomposition: decomposition
• Complex → simple or compound → elements
• Write the balanced decomposition equation of magnesium
bromide.
• Single Replacement Reaction
• Metal(A) + Ionic solution → Ionic solution + Metal(B)
• Write the balanced equation of nickel added to the solution of
magnesium chloride.
• Double Replacement
• Solution + solution → cations change partners (thoughts: can a
cation change partner with an anion?)
• Write the balanced equation of adding the solution of sodium
phosphate into the solution of manganese (II) chloride.
• Write complete ionic equation.
• Write net ionic equation.
• Dissociation equation:
• Solid ionic compound is put into water. Ionic compound will
dissociate into cations and anions.
• Write the balanced equation of when calcium iodide is put into
water.