WorksheetsStoichiometry Super Review
Total questions: 45
Worksheet time: 2hrs 24mins
If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the _____.
Mole ratios are obtained from the _____.
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
When the lab is finished.
When the excess reactant is used up.
When the limiting reactant is used up.
Chemical reactions never stop.
Mg + 2HCl --> MgCl2 + H2
H2
MgCl2
How many grams are in 7.8 moles of NaCl?
476 grams
460 grams
452 grams
462 grams
CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
1 Mg + 2 HCl --> 1 MgCl2 + 1 H2
Complete the equation for the percent yield of a chemical reaction: Percent yield=(________)÷(________)×100%
LiOH + KCl → LiCl + KOH
You actually produced 6 grams of lithium chloride, and you began this reaction with 20 grams of lithium hydroxide. What is your percent yield?
In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?
CH4 + 4 Cl2 → CCl4 + 4HCl
What is the mass of one mole of HCl? (hydrogen and chlorine)
35.45 g
70.9 g
36.458 g
145.832 g
CH4 + 4Cl2 → CCl4 + 4HCl
What coefficient is in front of CCl4?
1
2
4
6
CH4 + 4Cl2 → CCl4 + 4HCl
When do we use the coefficients in front of these compounds?
When finding the mass of one mole of a compound.
When finding the total mass that we have of a compound.
When finding the number of moles of OTHER compounds.
When finding the number of moles from a mass.
CH4 + 4Cl2 → CCl4 + 4HCl
If there are 12 moles of HCl produced from the reaction, how many moles of CH4 went into the reaction?
1
3
4
12
CH4 + 4 Cl2 → CCl4 + 4 HCl
If we have 12 moles of HCl come out of the reaction, how many moles of Cl2 had to go in to the reaction?
1
4
6
12
CH4 + 4 Cl2 → CCl4 + 4HCl
If 3 moles of CH4 go into the reaction, how many grams of CH4 was there?
39.057 g
16.043 g
48.129 g
49.052 g
2NaCl + F2 → 2NaF + Cl2
In this reaction, 233.76 g of NaCl and 37.996 g of F2 were combined.
After the reaction, a scale showed the total mass of the products as 324.742 g. Are the scales working properly?
No
Yes
Percent yield=(________)÷(________)×100%
2H2 + O2 → 2H2O How many moles of oxygen are consumed if 8 moles H2 are used?
How many grams of hydrogen are produced if 120 g of Na are available?
2NaClO3 (s) --> 2NaCl (s) +3 O2 (g) 12.00 moles of NaClO3 will produce how many grams of O2?
2CO + O2 → 2CO2 How many liters of carbon dioxide are produced from 10L of carbon monoxide?
How many liters of NH3 are needed to react completely with 30.0L of NO? 4NH3+6NO → 5N2 + 6H2O
What is the mole ratio in the following reaction: 2CO + O2 → 2CO2
0:0:0
What is the molar mass of table salt (NaCl)?
116.89 g/mol
35.45 g/mol
22.99 g/mol
58.44 g/mol
What is the molar mass of NaOH?
40.00 g/mol
38.99 g/mol
23.99 g/mol
57.00 g/mol
2H2 + O2 → 2H2O How many moles of water can be produced if 8 moles H2 are used?
The equation for percent yield is:
What is a limiting reagent?
Something that speeds up a reaction.
What you run out of first.
What you have left over.
Something that slows down a reaction.
What is an excess reagent?
The amount you end with.
What you run out of first.
What you have left over.
What you start with.
The Formula to make S'mores is 2C + 1M + G2 → C2MG2. So, if you have 5 Marshmallows (M), 9 Chocolate Pieces (C), and 9 Graham crackers Halves (G), how many S'mores can you make?
To convert L to mL, one should:
divide by 1000
multiply by 1000
divide by 100
multiply by 100
The _____ in a balanced equation reveals the mole ratios of the substances involved.
Subscript
Coefficients
Superscript
Total number in each compound
What is the limiting reagent in the image?
HCl
H2
Cl2
