Ch (2) : Calculations With Chemical Formulas And Equations
QUIZ FOR (( calculations with chemical formulas and equations )) Faculty of Engineering, Zagazig University BY &
- 1.Percentage of Magnesium [Mg] in Magnesium sulfate [MgSO4] Given Atomic Weights: Mg = 24 . S = 32 . O = 16
- A.
40
- B.
20
- C.
12
- D.
60
- 2.
![Balance the following equation:
Mg3N2 + H2O Mg(OH)2 + NH3
- ProProfs]( "Balance the following equation:
Mg3N2 + H2O Mg(OH)2 + NH3")
Balance the following equation: Mg3N2 + H2O Mg(OH)2 + NH3- A.
Mg3N2 + 6H2O --> 3Mg(OH)2 + 2NH3
- B.
Mg3N2 + 6H2O --> 3Mg(OH)2 + NH3
- C.
Mg3N2 + 2H2O --> Mg(OH)2 + NH3
- D.
Mg3N2 + 3H2O --> 3Mg(OH)2 + 2NH3
- 3.Calculate the mass % of carbon in carbon monoxide.
- 4.
![A reaction that produces crude iron from iron ore is shown below:
Fe2O3 (s) + 3CO (g) 2Fe (s) + 3CO2 (g)
How many moles of iron could be produced from the reaction of 10 mol Fe2O3 and 25 mol of CO?
- ProProfs]( "A reaction that produces crude iron from iron ore is shown below:
Fe2O3 (s) + 3CO (g) 2Fe (s) + 3CO2 (g)
How many moles of iron could be produced from the reaction of 10 mol Fe2O3 and 25 mol of CO?")
A reaction that produces crude iron from iron ore is shown below: Fe2O3 (s) + 3CO (g) 2Fe (s) + 3CO2 (g) How many moles of iron could be produced from the reaction of 10 mol Fe2O3 and 25 mol of CO?- A.
10 mol
- B.
25 mol
- C.
17 mol
- D.
20 mol
- E.
35 mol
- 5.You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements
- A.
SO
- B.
SO2
- C.
SO4
- D.
SO3
- 6.Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula
- A.
NaPO2
- B.
Na2PO3
- C.
Na3PO4
- D.
NaPO4
- 7.Styrene has the empirical formula CH, and there is 92.25% carbon and 7.75% hydrogen. If you have a molar mass of 104g/mol, what is the multiplier or factor to get the molecular formula?
- A.
6
- B.
2
- C.
4
- D.
8
- 8.Al(OH)3 + 3HCl --> 3H2O + AlCl3 If you have 14.0 grams of aluminum hydroxide, how much aluminum chloride is produced?
- A.
14.0 g
- B.
17.9 g
- C.
23.9 g
- 9.Al(OH)3 + 3HCl --> 3H2O + AlCl3 If you actually recovered 22.0 grams of aluminum chloride, what is the percent yield of the reaction?
- A.
100%
- B.
92%
- C.
69%
- 10.What is the percentage of oxygen in carbon dioxide? (CO2)
- 11.Empirical Formula: 39.8% K, 27.8% Mn, 32.5% O
- A.
N3,Mn,5O
- B.
K2,Mn,O4
- C.
Mn3,K,O7
- D.
O10,Mn,5K
- 12.The simplest formula of a substance shows
- A.
the actual number of atoms of each element in one molecule of a substance.
- B.
the elements that make up one molecule of the substance and the simplest whole number ratio between the atoms.
- C.
the number of molecules in a sample of the substance.
- D.
the molecular mass of the substance.
- 13.A compound is found to have a molecular mass of 90 atomic mass units and simplest formula of C2H5O. The molecular formula of the substance is: (Atomic mass of C = 12 amu, H = 1 amu, O = 16 amu)
- A.
C3H6O3
- B.
C4H26O
- C.
C4H10O2
- D.
C5H14O
- 14.How many grams of oxygen are in one mole of calcium carbonate, CaCO3? (Atomic mass of O = 16 amu.)
- A.
16 grams
- B.
32 grams
- C.
48 grams
- D.
64 grams
- 15.The ionic compound containing Fe3+ and SO42- would have the formula
- A.
FeSO4
- B.
Fe2SO4
- C.
Fe2(SO4)3
- D.
Fe3(SO4)2
Questions: 10 | Attempts: 13851 | Last updated: May 6, 2020
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