Honors Homework Set 9-1: Introduction to Stoichiometry
1. The unbalanced chemical equation shows the reaction between potassium chloride (KCl) and oxygen (O2).
KCl + O2  KClO3
When the equation is balanced, what is the molar ratio of O2 to KClO3?
2. Consider the combustion reaction of propane (C3H8):
C3H8 (g) + O2 (g)  CO2(g) + H2O (g)
[NOT BALANCED]
(a) Write the balanced chemical equation for the reaction above.
(b) Write 4 different mole ratios that can be derived from this equation.
(c) How many moles of CO2 are produced from the combustion of 6.40 mol C3H8?
3. Carbon disulfide is an important industrial solvent. It is commonly produced by the reaction represented below:
5 C (s) + 2 SO2 (g)  CS2 (l) + 4 CO (g)
(a) How many moles of CS2 forms when 2.7 mol C reacts?
(b) How many of moles of SO2 are required to produce 118 mol CO?
4. The elements lithium and oxygen react explosively to form lithium oxide.
(a) Write a balanced chemical equation for this reaction.
(b) How many moles of lithium oxide will form if 1.68 mol of lithium react?
5. Consider the double replacement reaction between barium acetate and potassium phosphate.
(a) Write a balanced chemical equation for this reaction.
(b) If 4.36 mol of potassium phosphate react, how many moles of barium phosphate are produced?
(c) How many grams of barium phosphate does this represent?