Stoichiometry
3 Mg + 2 Al(NO3)3 → 3 Mg(NO3)2 + 2 Al
If 2.59 moles of Al(NO3)3 are reacted, how many moles of Mg will also be reacted?
3.89 moles Mg
A formula with the lowest whole # ratio of elements in a compound is called a/an
empirical formula
La reacts with water to form lanthanum (III) hydroxide and hydrogen gas. 0.547 grams of lanthanum (III) hydroxide should have been formed, but the reaction only produced 0.250 grams. What is the percent yield of this reaction?
45.7% yield
What side of the arrow do you find reactants?
left
Which way does air move when there is a pressure difference?
from high pressure to low pressure
S8 + 12 O2 → 8 SO3
If 3.7040 moles of SO3 are produced, how many liters of O2 were reacted at STP?
124.45 liters O2
What is the empirical formula for C4H6?
C2H3
Aluminum reacts with manganese (IV) oxide to form aluminum oxide and Mn. 3.15 grams of aluminum oxide should have been formed, but the reaction only produced 2.26 grams. What is the percent yield of this reaction?
71.7% yield
What is an excess reactant?
The EXCESS reactant is the reactant that there is EXTRA of after the reaction has stopped
Why did we heat the can up?
to increase the pressure
2 HNO3 + Ba(OH)2 → Ba(NO3)2 + 2 H2O
If 44.2 grams of Ba(NO3)2 are produced, how many moles of H2O will also be produced?
0.338 moles H2O
If the molecular formula had two oxygens, what is the complete molecular formula for C2H6O?
C12H4O2
Hydrogen gas combines with oxygen gas to form water. This reaction, which should have produced 6.43 grams of water, had 75.14% yield. What was the actual yield of this reaction in grams?
4.83 g
What is a limiting reactant?
The limiting reactant is the reactant that runs out first.
Why did we cool the can down?
to decrease pressure
Ca3P2 + 6 H2O → 3 Ca(OH)2 + 2 PH3
If 390 grams of Ca3P2 are reacted, how many grams of Ca(OH)2 will be produced?
480 grams Ca(OH)2
Which pair has the same empirical formula?
NaCrO4 and Na2Cr2O7
C2H4O2 and C6H12O6
C3H6O3 and C2H6O2
CH4 and C2H6
C2H4O2 and C6H12O6
Sulfur tetrafluoride reacts with water to form sulfur dioxide and hydrofluoric acid. This reaction, which should have produced 48.08 grams of sulfur dioxide, had 60.01% yield. What was the actual yield of this reaction in grams?
28.85 g
If a recipe calls for 2 eggs and 3 cups of flour for each batch of cookies and you have 4 dozen eggs alongside 75 cups of flour, which ingredient is the limiting reactant?
eggs
Explain why there was so much water in the can when you pulled it out of the coffee can?
a. the water entered the soda can when you turned it up side down and inserted it into the coffee can
b. the air pressure in the room pushed the water into the soda can
c. cold water is more dense and moved into the soda can
d. hot water is less dense than cold air
b. the air pressure in the room pushed the water into the soda can
H2 + 2 C + N2 → 2 HCN
If 351 grams of N2 are reacted, how many particles of HCN will be produced?
1.51 × 1025 particles HCN
If the empirical formula of sugar is CH2O and it has a molar mass of sugar is 180 g/mol, what is the molecular formula for sugar?
C6H12O6
When heated, phosphorous acid breaks down to form phosphoric acid and phosphorus trihydride. This reaction produced 46.06 grams of phosphoric acid at 82.67% yield. What was the theoretical yield of this reaction in grams?
55.72 g
C2H4 + 3O2 -> 2CO2 + 2H2O
If you are given equal amounts of each reactant, which reactant will be in excess?
C2H4
What is the role of the ice cold in the water?
a. the cold water is more dense and made the soda can heavier thus crushing the sides of the can
b. the cold water created a pressure difference by making aluminum cold and causing it to shrink
c. the cold water created a high pressure by condensing the water inside the soda can and lowering the temperature of the air causing it to rise
d. the cold water created less pressure inside the can by condensing the water in the soda can and lowering the temperature of the air in the can causing it to shrink
d. the cold water created less pressure inside the can by condensing the water in the soda can and lowering the temperature of the air in the can causing it to shrink