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Mole And Stoichiometry Review
Test Description: Follows all TEKS
Instructions: Answer all questions to get your test result.
1) What is the coefficient for potassium in the balanced equation: ___Na + ___K2S — ___K + ___Na2S
A
6
B
4
C
8
D
2
2) For the reaction ___HCl + ___NaOH — ___NaCl + ___H2O, which is the limiting reactant given 100.0 g of sodium hydroxide and 100.0 g of hydrochloric acid?
A
sodium hydroxide
B
hydrochloric acid
C
water
D
sodium chloride
3) In the reaction A + B — C + D, if element B is the excess, then —
A
B is the limiting reactant
B
A, B, and C are all limiting reactants
C
C is the limiting reactant
D
A is the limiting reactant
4) In the reaction __RbNO3 — ___RbNO2 + ___O2, how many moles of O2 are produced when 5.0 mol of RbNO3 decompose?
A
3.0 mol
B
1.0 mol
C
7.5 mol
D
2.5 mol
5) In the reaction ___H2 + __O2 — ___H2O, How many moles of oxygen are required to fully react with 6.0 mol of hydrogen?
A
6.0 mol
B
12.0 mol
C
3.0 mol
D
18.0 mol
6) Calculate the number of molecules present in .20 mols of H2O.
A
2.9 x 10 to the power of 25 molecules
B
2.4 x 10 to the power of 23 molecules
C
5.1 x 10 to the power of 22 molecules
D
1.2 x 10 to the power of 23 molecules
7) The sum of the atomic masses of all the atoms in a formula for a covalent compound is the—
A
formula mas
B
Avogadros number
C
molecular mass
D
real mass
8) How many grams of NaCl are preset in 11.00 moles?
A
0.4500 g
B
331.0 g
C
156.6 g
D
642.9 g
9) What is the molecular mass of MgSO4?
A
120.37 amu
B
111.21 amu
C
116.13 amu
D
272.83 amu
10) A molecule has been identified to contain 40.9% carbon, 4.58% hydrogen, and 54.5% oxygen. What is the empirical formula for the compound?
A
C10HO12
B
CHO
C
CH2O
D
C3H4O3
11) Calcium hydroxide and hydrochloric acid react to form calcium chloride and water. If the chemicals are present in exactly the correct ratios to fully use all of the ingredients, how many moles of water can be formed from 5 moles of hydrochloric acid?
A
5 moles
B
1 mole
C
10 moles
D
2 moles
12) How many moles are in 75.0 grams of nitrogen gas?
A
4.52 x 10 to the power of 25 moles
B
3.00 moles
C
2.68 moles
D
0.333 moles
13) In the reaction __H2 + ___O2 — ___H2O, what is the mole ratio of hydrogen to water?
A
1:2
B
2:2
C
2:1
D
4:4
14) How many moles of CO2 are present in 200.0 g?
A
9.08 mol
B
.22 mol
C
4.54 mol
D
88.02 mol
15) A three mole sample of K2S would have how many atoms of potassium?
A
2.01 x 10 to the power of 23
B
3.62 x 10 to the power of 24
C
1.21 x 10 to the power of 24
D
1.81 x 10 to the power of 24
16) if a sample contained 3.01 x 10 to the 23rd power atoms of tellurium, how many grams would this be?
A
63. 8 g
B
382.8 g
C
127.6 g
D
255.2 g
17) How many moles are there in a sample containing 2.408 x 10 to the 24th power atoms of carbon?
A
4.000
B
12.00
C
6.000
D
2.000
18) ___Cu2S + ___O2 — ___Cu2O + ___SO2 What is the greatest mass of SO2 that can be produced from 15 mol Cu2S?
A
721 g SO2
B
961 g SO2
C
480 g SO2
D
1920 g SO2
19) ___CaCO3 + ___HCl — ____CO2 + ___H2O this equation was used to find that only 100 g of CO2 was produced. If 200 g of HCl were used to begin the reaction, what is the percent yield?
A
100%
B
82.8%
C
87.6%
D
96.3%
20) What is the definition of the limiting reagent?
A
The reactant that produces the smallest amount of product
B
The largest value for the product
C
The reaction that produces the larges amount of product
D
The smallest value for the product
*select an answer for all questions
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