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WorksheetsStoichiometry Pre Test
Total questions: 25
Worksheet time: 25mins
Where does the mole ratio come from?
the molar mass of the reactants in the balanced chemical equation
the coefficients of the balanced chemical equation
the subscripts of the products in the balanced chemical equation
the group number of each element in the balanced chemical equation
NH3 + 5 O2 → 4 NO + 6 H2O
What is the mole ratio of oxygen to water? (a)
What is the mole ratio of NH3 to NO? (b)
What is the mole ratio of NH3 to oxygen? (c)
What is the mole ratio of H2O to NH3? (d)
6/5
4/4
4/5
6/4
4/6
5/6
5/4
6/6
FeS + 7 O2 → 2 Fe2O3 + 4 SO2
Place the numbers in the correct spots to solve this problem: how many moles of FeS will be needed to produce 13.72 moles of Fe2O3? (end amount is the answer)
4 mol Fe2O3
2 mol FeS
13.72 mol FeS
6.86 mol FeS
27.44 mol FeS
4 mol SO2
13.72 mol Fe2O3
4 mol FeS
2 mol Fe2O3
7 mol O2
Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3. If 30 g of aluminum and 80g of chlorine are reacted, identify the limiting reactant.
(a)
The blue numbers in the image below represent ________
I don't know, and don't want to try
coefficients
subscripts
none of the answers are correct
Calculate the molar mass of NH4NO2. Round to the nearest whole number.
(a)
Find the mass of 3.8 mol of H2O. Round to the nearest tenth.
57.9 g
54.8 g
68.5 g
62.3 g
How many molecules of Octane would be found in 8.4 moles of Octane (C8H18)?
5.77 x 1023
5.06 x 1024
5.77 x 1026
5.06 x 1023
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of Al2(SO4)3 would be formed if 250g H2SO4 completely reacted with aluminum? Round your answer to the nearest whole number.
(a)
What is the limiting reactant if 10 moles of NH3 react with 30.0 moles of NO?
4NH3+6NO --> 5N2 + 6H2O
NH3
NO
N2
water
What is the molar mass of NaOH?
40 g/mol
31 g/mol
23.998 g/mol
20 g/mol
What is the molar mass of 2CO2?
64
88
32
44
What is the mole ratio of H2O to H3PO4 in the following chemical equation?
1 to 6
3 to 2
4 to 6
2 to 3
Knowing the mole ratio of a reactant and product in a chemical reaction would allow you to determine:
the energy released in the reaction.
the speed of the reaction.
whether the reaction is reversible.
the mass of the product produced from a known mass of reactant.
In the reaction represented by the equation CH4(g) + O2(g) ----> CO2(g) + H2O(g), a mass of 125 g CH4is reacted with excess oxygen. The expression:
mass of oxygen redacted.
mass of carbon dioxide produced.
mass of water produced.
none of the above.
In the equation 6CO2+6H2O → C6H12O6+6O2 the mole ratio of water to oxygen is:
2 : 1
1 : 1
3 : 2
6 : 8
In the equation Al2(SO4)3+3Ca(OH)2 → 3CaSO4 +2Al(OH)3 , , the mole ratio of calcium hydroxide to aluminum hydroxide is:
1 : 3
2 : 3
1 : 1
3 : 2
For the reaction represented by the equation N_2+3H_{2 ightarrow ext{2NH}_3}, how many moles of nitrogen (N2) are required to produce 18 grams of ammonia (NH3)?
0.9 mol
18 grams
0.53 mol
36 grams
The most steps are required to solve stoichiometry problems when the reactant is given in grams and the product is sought in
moles.
grams.
liters.
number of atoms.
For the reaction represented by the equation Pb\left(NO_3\right)_2+2KI\ \rightarrow\ PbI_2+2KNO_3 how many moles of lead iodide\left(PbI_2\right)are produced of 300 grams potassium iodide\left(KI\right) when Pb\left(NO_3\right)_2 is in excess?
114.78 mol PbI2
0.904 grams PbI2
0.904 mol PbI2
114.78 grams PbI2
For the reaction represented by the equation 2KClO3→ 2KCI+302 how many grams of potassium chlorate are required to produce 160. g of oxygen?
408 g KClO3
804 g KClO3
598 g KClO3
There is not enough information.
What is the mole ratio of hydrogen to oxygen in the reaction 2H_2 + O_2 -> 2H_2O?
1:1
2:1
2:2
1:2
In the reaction 4Fe + 3O_2 -> 2Fe_2O_3, how many moles of Fe_2O_3 are produced from 8 moles of Fe?
2 moles
4 moles
6 moles
8 moles
If 5 moles of nitrogen gas react with 15 moles of hydrogen gas according to the equation N_2 + 3H_2 -> 2NH_3, what is the limiting reactant?
Nitrogen gas
Hydrogen gas
Ammonia
None
Calculate the molar mass of CaCO_3.
100 g/mol
150 g/mol
200 g/mol
250 g/mol
