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WorksheetsCHE 025 MIDTERM QUIZ
Total questions: 30
Worksheet time: 8hrs 30mins
The quantitative study of reactants and products in a chemical reaction is known as________.
mole method
empirical formula
stoichiometry
molecular formula
Ammonia is synthesized from hydrogen and nitrogen as: N2(g) + 3H2(g) ---> 2NH3(g) .From the given equation, how many moles of N2 reacts with three moles of H2 to form two molecules of NH3?
4
3
2
1
Ammonia is synthesized from hydrogen and nitrogen as: N2(g) + 3H2(g) ----> 2NH3(g). From the equation, how many moles of ammonia is formed from the reaction?
4
3
2
1
What mole ratio are to be used to calculate number of moles of ammonia from the given equation? 3H2(g) + N2(g) ----> 2NH3(g)
2 moles NH33 moles H2
3 moles H22 moles NH3
3 moles H21 mole N2
1 mole N23 moles H2
How many moles of ammonia can be produced from 6.0 mole of hydrogen reacting with nitrogen?
3H2(g) + N2(g) ----> 2NH3(g)
4.0 mol NH3
3.0 mol NH3
2.0 mol NH3
1.0 mol NH3
When 6 moles of H2 reacted with 3 moles of N2 to produce, NH3, which is the limiting reactant?
H2
N2
none because all quantities are consumed in the reaction
NH3
A formula for a compound is given as C2H12O6. This is a (an)
empirical formula
structural formula
molecular formula
formula unknown without further information.
The percent composition of a compound is obtained by dividing the mass of each element in a compound by the ___________ of that compound.
molecular/molar mas
number of moles
Avogadro’s number
all of the above
Which of the following is correct about the formula or molar mass of the compound?
The sum of the product of the number of atoms and the atomic weight of each element present in a compound.
The product of the number of atoms and the atomic weight of each element present in a compound.
The number of atoms and the atomic weight of each element present in a compound.
All of the above
Which of the following pairs of compounds have the same empirical formula?
ethane, C2H6 and butane, C4H10
ethanol, C2H5OH and dextrose, C6H12O6
acethylene, C2H2 and benzene, C6H6
A. diphenyl ether, C12H10O and phenol, C6H5OH
Which of the following is a true formula that gives the actual number of atoms that compose a given compound?
empirical formula
molecular formula
molecular mass
formula mass
Which of the following represents the lowest whole-number ratio of the atoms in a compound?
empirical formula
molecular formula
formula mass
molecular mass
Which is the correct mass percentage of nitrogen in acetamide, C2H5NO?
32.56 %
23.72 %
25.46 %
29.77 %
What is the percent by mass of Oxygen in aspirin (C9H8O4)?
35.00%
35.70%
35.56%
35.65%
The oxidation no of chlorine in KClO3 is _______.
+7
+5
+3
-1
The oxidation no. of N in N2 is _______.
+5
+3
-3
0
Given the chemical reaction : 4Fe + 3O2 + 6H2O ----------> 2 Fe2O3 + 3H2O. The oxidizing agent is ___.
Fe
O
H
None
Given the chemical reaction : 4Fe + 3O2 + 6H2O ----------> 2 Fe2O3 + 3H2O. Which is reduced?
Fe
O
H
None
Given the chemical reaction : 4Fe + 3O2 + 6H2O ----------> 2 Fe2O3 + 3H2O. Which is oxidized?
Fe
O
H
None
Given the chemical reaction : 4Fe + 3O2 + 6H2O ----------> 2 Fe2O3 + 3H2O. When an atom is oxidized the oxidation number ___
increases
decreases
always decrease by 2
has no changes
Reduction means ________________.
gain of electrons
loss of electrons
electronegativity
ionization
What is the mass of 3.15 moles of Al?
84.987 g Al
83.987 g Al
82.987 g Al
81.987 g Al
What is the molar mass of ethanol (C2H5OH)?
46.37 g/mol
46.27 g/mol
46.17 g/mol
46.07 g/mol
Consider the reaction: C3H8(g) + 5O2(g)à3CO2(g) + 4H2O(g) What mass of oxygen will react with 96.1 grams of propane C3H8(g?
329 grams of oxygen is required to burn 96.1 grams of propane
339 grams of oxygen is required to burn 96.1 grams of propane
349 grams of oxygen is required to burn 96.1 grams of propane
359 grams of oxygen is required to burn 96.1 grams of propane
What is the molar mass of ammonium sulfite, (NH4)2 SO3?
116 g/mol
117 g/mol
118 g/mol
119 g/mol
What is the number of moles in a 1.52 kg sample of glucose (C6H12O6)?
8.45 mol C6H12O6
8.44 mol C6H12O6
8.43 mol C6H12O6
8.42 mol C6H12O6
Propane (C3H8) reacts with Oxygen gas to form Carbon dioxide and Water. If 2.8 moles of Propane reacts with excess Oxygen gas, how many grams of CO2 will form?
366.7 g CO2
367.7 g CO2
368.7 g CO2
369.7 g CO2
Propane (C3H8) reacts with Oxygen gas to form Carbon dioxide and Water. If 38 grams of water are produced in the reaction, how many moles of CO2 were produced?
1.55 mol CO2
1.56 mol CO2
1.57 mol CO2
1.58 mol CO2
Aluminum reacts with chlorine gas to form Aluminum Chloride. How many grams of Chlorine will react completely with 42.8 grams of Aluminum?
168.71 g Cl2
169.71 g Cl2
168.72 g Cl2
168.73 g Cl2
How many moles of water are in 50.0 g of water?
2.77 moles H2O
2.78 moles H2O
2.79 moles H2O
2.76 moles H2O
