Stoichiometry Final Exam Review 4e, 4f, 4g
Quiz by Darrien James
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- Q1
2H2 + O2 → 2H2O
How many moles of oxygen are consumed if 8 moles H2 are used?
(hint: mol to mol)
2
8
4
6
30s - Q2
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe
What is the ratio of moles of MgO to moles Fe? (hint- look at the coefficients)
3 mol Mg / 2 mol Fe
3 mol MgO/ 2 mol Fe
2 mol Mg/ 3 mol Fe
3 mol MgO/ 1 mol Fe
30s - Q3
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely? (hint- mol to mol)
1.0 mol
4.5 mol
10.1 mol
6.7 mol
30s - Q4
2Na + 2H2O → 2NaOH + H2
How many grams of hydrogen are produced if 120 g of Na are available?
690 g
2.6 g
5.2 g
45 g
30s - Q5
CH4 + 2 O2 → CO2 + 2 H2O
How many moles of CO2 are produced from the combustion of 110 g of CH4? (hint- mass to mol)
6.85 mol
2.75 mol
13.7 mol
6.85 mol
30s - Q6
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
(hint- mol to mass)
256 g O2
576 g O2
777 g O2
288 g O2
30s - Q7
B2H6 + 3O2 -->2 HBO2 + 2 H2O
What mass of O2 will be needed to burn 36.1 g of B2H6?
(hint- mass to mass)
105 g O2
3.86 g O2
13.8 g O2
124 g O2
30s - Q8
4 Al + 3 O2 –> 2 Al2O3 How much aluminum would be needed to completely react with 45 grams of O2? (hint- mass to mass)
35.0 g
1.875 g
3.75 g
50.5 g
30s - Q9
What is the molar mass of C6H12O6?
180.18 g/mol
320.7 g/mol
84.18 g/mol
29.02 g/mol
30s - Q10
Using the following equation: Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
9 moles Fe
6 moles Fe
4 moles Fe
2 moles Fe
30s - Q11
B2H6 + 3O2 -->2 HBO2 + 2 H2O What mass of O2 will be needed to burn 36.1 g of B2H6?
(hint- mass to mass)
15.5 g O2
3.86 g O2
125.2 g O2
13.8 g O2
30s - Q12
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams Al2(SO4)3 would be formed if 250.0 g H2SO4 completely reacted with aluminum?
(hint- mass to mass)
290 g
870 g
450 g
0.850 g
30s - Q13
A limiting reactant is a reactant that
determines the amount of product that can be made
all of these
runs out during a chemical reaction
causes a reaction to stop
30s - Q14
When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?
90.4 %
104 %
96.15 %
1.04 %
300s - Q15
Aluminum, a silver colored metal, is placed in a solution of copper sulfate (CuSO4) which is blue. The reaction produces a reddish brown copper (Cu) metal and a colorless aluminum sulfate (Al2(SO4) 3) solution. The table below summarizes the observation data. Which substance is the limiting reactant?
CuSO4, because it is completely consumed.
CuSO4, because it is completely consumed.
Al, because it is left over after the reaction.
Al, because it is completely consumed.
30s
