Moles (mol)
Mass (g)
Particles (FU) &
Volume (L)
Molarity (M)
Potpourri
100

What is the mole ratio of oxygen to carbon dioxide in the combustion of propane (C3H8)?

5 mol O2 : 3 mol CO2

(5 : 3)

100

What mass of CO2 is produced when 20.0 g of H2O is collected?

36.6 g CO2

100

Besides calling them "particles" or "formula units," what are 2 other labels (units) that mean the same thing in stoichiometry?  In other words, what are the 2 types of pure substances?

atoms

molecules

100

When setting up a stoichiometry problem involving molarity (M), how do you write units for molarity so that they cancel other units?

mol / L

100

1 mole (6.02x1023) basketballs would occupy roughly the volume of __.

Earth

200

If 10.0 moles of oxygen are available to burn, how many moles of carbon dioxide will be produced?

6.00 mol CO2 produced

200

What is the molar mass of CO2?

(answer to 2 decimal places)

44.01 g/mol

200

A standard tank of propane contains roughly 75.7 L C3H8.  If an entire tank is burned over a summer of grilling, how many liters of CO2 were produced?

225 L CO2

200

Draw a molecular diagram showing the difference between 3.0 M NaCl and 9.0 M NaCl.

Picture should show 3X as many NaCl molecules in the 9.0 M container vs the 3.0 M container.
200
Draw the algebraic triangle used to solve for molarity, volume or moles.

n (moles) on top

M and L on bottom row

300

1 mole =

a) ___ L (#)

b) ___ FU (#)

c) ___, in g (term)

a) 22.4 L

b) 6.02x1023 FU

c) molar mass

300

If the reaction begins with 100.0 g O2 , what mass of CO2 is produced?

82.52 g CO2 produced

300

If 2.5x1020 molecules of propane are burned, how many molecules of carbon dioxide are produced?

7.5x1020 molecules CO2 produced

300

What is the average concentration (molarity) of salt in ocean water if there are 35 grams of salt per liter?

M = 0.5989 mol/L

300

1 grilled cheese sandwich requires 2 slices of bread and 1 slice of cheese.  If I bought a loaf of bread (20 slices) and a pack of cheese singles (12 slices) from the grocery store, what is my "limiting reactant," how many sandwiches can I make, and how many slices of the "excess reactant" remain afterward?

LR = bread

10 sandwiches

2 slices of cheese remain

400

How many moles of oxygen are required to burn 25.0 L of propane?

5.58 mol O2

400

What is the mass of LiF in 250 mL of a 5.0 M solution?

32.4 g LiF

400

If 5.0 L of propane are burned, how many molecules of oxygen are required to burn it all?

6.7x1023 molecules O2

400

What is the molarity of solution when 230 mL of 3.3 M CaCO3 is diluted with 70 mL of water? 

M2 = 2.53 mol/L

400

What are 4 factors that can increase reaction rate?  (100 pts each)

1. greater molarity

2. greater surface area

3. greater temperature

4. a catalyst

500

If 4.2 mol C3H8 reacts with 15.1 mol O2 , what is the excess reactant and how much will remain after the reaction?

ER = C3H8

1.17 mol remains after

500

If the reaction starts with 60.00 g C3H8 and 200.0 g O2 , what is the limiting reactant and what mass of water vapor (g) will be produced?

LR = O2

90.10 g H2O produced

500

If a 1 pound of propane (0.4536 L) is burned in a Mr. BuddyTM heater with an excess of oxygen and 3.456x1022 water molecules were collected from condensation, what was the % yield of water collected?

70.9% yield

500

What is the mass of solute in a 555 mL solution of 3.0 M HCl?

60.9 g HCl

500

How many mL of water must be added to dilute 0.25 L of 12.0 M stock HCl solution into a 3.0 M HCl solution?

add 750 mL of water

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