Question

Two chemical reaction occur:

#1. Solid potassium and aqueous solution zinc chloride yields zinc solid and potassium
chloride (aq)
#2. A hydrocarbon gas, C 3 H 8 reacts with oxygen to form water and carbon dioxide

For each reaction (#1,#2) answer the following questions. Remember to use significant figures, units.

a) What is the balanced chemical equation for reaction #1?
What is the balanced chemical equation for reaction #2?

b) Express zinc chloride as particles, moles, mass in reaction #1
Express the oxygen as particles, moles, mass in reaction #2

c) How many molar ratios are possible in the chemical equation #1
How many molar ratios are possible in the chemical equation #2

d) What is the type of chemical reaction for reaction #1?
What is the type of chemical reaction for reaction #2?

If you are given 10.0 g of each reactant in the chemical reactions

e) What is the limiting reactant of reaction #1?
What is the limiting reactant of reaction #2?


f) What is the excess reactant in reaction #1?
What is the excess reactant in reaction #2

g) How much of the solid is produced in reaction #1
How much of the gas is produced in reaction #2

h) How much of the excess reactant remains after the #1 reaction?
How much of the excess reactant remains after the #2 reaction?

Answer 1

a.) 2K (s) + ZnCl2 (aq) ---> Zn (s) + 2KCl (aq)

C3H8 (g) + 10O (g) ---> 4H2O (l) + 3CO2 (g)

b.) ZnCl2 = aqueous particle; 1 mol; 136.286 g

O=gaseous particle; 10 mols; 160 g

c.) 4 (?)

4 (?)

d.) Precipitation reaction

Combustion reaction

e.) ZnCl2 is the limiting reactant

O is the limiting reactant

f.) K is the excess reactant

C3H8 is the excess reactant

g.) 1 mol

3 mols