Unit Conversions, Balancing Equations and Empirical Formulas
Convert 15.64 g carbon to moles carbon:
Convert 7.38 moles Mg to grams magnesium:
Convert 2.75 g F2 to moles F2, F2 molecules and F atoms
Complete and Balance the following double displacement reaction.
____(NH4)2CO3 (aq) + ____AlCl3 (aq) →
Write the ionic and net ionic equations (show phase and charge of reactants and products)
Which ions are the spectator ions?
Determine the empirical formula of the compound with the following mass percents of the
elements present: 58.5% C; 4.91% H; 19.5% O; 17.1% N
Determine the empirical formula of the compound that is 26.4% by mass Na, 36.8% by mass S
and also contains oxygen.
Stoichiometry
When 21.72 g lithium metal is reacted with 104.0 g oxygen gas lithium oxide is produced.
Balance the following equation:
Li
+
O2
→
Li2O
How many moles of each reactant are present?
What is the reactant molar ratio? The actual molar ratio from the equation?
What is the limiting reagent?
How many grams of the Li2O should theoretically be produced in this reaction?
If 31.49 g Li2O are actually recovered after carrying this reaction out in the lab, what was the
percent yield of the reaction?
How many moles of excess reactant will remain following this reaction? How many grams?