Practice: Write the balanced equation for the following by inserting the correct coefficients in the blanks.
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Balancing Chemical Equations is the first step in future chemical calculations.
Balancing Chemical Equations
Example #1: Write the balanced equation for the following by inserting the correct coefficients in the blanks:
___ C4H10 (g) + ___ O2 (g) ___ H2O (l) + ___ CO2 (g)
Practice: Determine the total sum of the coefficients after balancing the following equation.
Practice: Write the balanced chemical equation for the reaction that occurs when the gasoline additive methyl tert-butyl ether, C5H12O (l), burns in air.
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Additional Problems
What is the coefficient of oxygen in the balanced combustion reaction of one (1) mole of acetone (C3H6O)?
a. 1
b. 2
c. 3
d. 4
e. 5
What is the sum of the coefficients for the reactants in the balanced equation for the combustion of
isopropyl alcohol:
______C3H8O + ______O2 → ______CO2 + ______H2O
a) 25
b) 13
c) 11
d) 6
e) none of the given answers
What is the sum of the coefficients for the products in the following chemical equation?
______ C12H26 (g) + ______ O2 (g) → ______ CO2 (g) + ______ H2O (l)
What is the coefficient of aluminum phosphate once the reaction below is balanced?
______ Hg3(PO4)2 (aq) + ______ Al (s) → ______ AlPO 4 (s) + ______ Hg (l)
When the following equation is balanced, the coefficient of sulfur dioxide is _____.
PbS (s) + O2 (g) → PbO (s) + SO2 (g)
A. 5
B. 1
C. 3
D. 2
E. 4
Write the balanced equation for the following reaction: aqueous sodium sulfide reacts with aqueous iron (III) nitrate to form aqueous sodium nitrate and solid iron (III) sulfide. What are the coefficients in the balanced reaction (write the substances in the order given)?
A. 1, 1, 1, 3
B. 1, 2, 2, 3
C. 3, 2, 6, 1
D. 2, 3, 1, 6
E. 3, 1, 1, 3
What are the coefficients for the decomposition of nitroglycerin?
__ C3H5N3O9 → __ N2 + __ CO2 + __ H2O + __ O2
A. 2,3,6,2,1
B. 2,3,6,5,1
C. 4,6,12,10,12
D. 4,3,12,10,1
E. 4,6,12,10,1
When the following equation is balanced, the coefficient of sulfur dioxide is _______.
PbS (s) + O2 (g) → PbO (s) + SO2 (g)
a. 5
b. 1
c. 3
d. 2
e. 4
When the chemical equation for the complete combustion of toluic acid, CH3C6H4CO2H, to form carbon dioxide and water is balanced, the coefficient in front of the O 2 is
a. 4
b. 10
c. 9
d. 5
e. 20
A reaction occurs between calcium nitrate and ammonium fluoride, producing calcium fluoride, dinitrogen monoxide, and water vapor. The correct set of stoichiometric coefficients, respectively, for the balanced reaction is:
A) 3 6 6 3 4
B) 3 2 1 2 2
C) 1 2 2 1 1
D) 1 2 1 2 4
E) 2 1 2 2 2
What is the sum of the coefficients when the following equation is balanced with the smallest whole number coefficients?
C12H10O + O2 → CO2 + H2O
(A) 31
(B) 32
(C) 64
(D) 65
(E) None of the above
After the following equation is balanced with the smallest possible whole numbers, what is the sum of the coefficients?
NO2(g) + H2(g) → NH3(g) + H2O (l)
(A) 4
(B) 10
(C) 15
(D) 17
(E) 20
Balance this equation using the smallest possible integers, S + HNO3 → H2SO4 + NO2 + H2O. What is the coefficient of the water?
(A) 1
(B) 2
(C) 4
(D) 6
(E) 10
Balance this equation using the smallest possible integers, NO + NH3 → N2 + H2O. What is the coefficient of the water?
(A) 1
(B) 2
(C) 3
(D) 6
(E) 12
When the equation below is balanced with the smallest set of coefficients, what is the coefficient of Zn?
Zn + HNO3 → Zn(NO3)2 + NH4NO3 + H2O
a. 1 (no coefficient written)
b. 2
c. 3
d. 4
e. 6
Write the described reaction as a balanced reaction equation: “Lead(II)nitrate solution is added to potassium iodide solution, which results in formation of solid lead(II)iodide while potassium nitrate remains in solution.”a) PbNO3(soln) + KI(soln) → PbI(solid) + KNO3(soln)b) Pb(NO3)2 + 2KI → 2PbI + 2KNO3c) Pb(NO3)2(aq) + KI2(s) → PbI2(s) + K(NO3)2(aq)d) Pb(NO2)(aq) + 2KI(aq) → PbK 2(s) + I2(NO2)(aq)e) Pb(NO3)2(aq) + 2KI(aq) → PbI 2(s) + 2KNO3(aq)
Balance the following chemical equations:
Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor.A) 2 C2H6 (g) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (g)B) C2H6 (g) + 5 O (g) → 2 CO (g) + 3 H2O (g)C) 2 C2H6 (g) + 5 O2 (g) → 4 CO (g) + 6 H2O (g)D) C2H6 (g) + 7 O (g) → 2 CO2 (g) + 3 H2O (g)E) 2 CH3 (g) + 5 O (g) → 2 CO (g) + 3 H2O (g)
Write the balanced chemical equations.Nitric acid forms when gaseous nitrogen dioxide reacts with gaseous oxygen and liquid water.
Balance the following equation: B2O3(s) + HF(l) → BF3(g) + H2O(l)A) B2O3 (s) + 6HF(l) → 2BF3 (g) + 3H2O(l)B) B2O3 (s) + H6F6(l) → B2F6(g) + H6O3 (l)C) B2O3 (s) + 2HF(l) → 2BF3 (g) + H2O(l)D) B2O3 (s) + 3HF(l) → 2BF3 (g) + 3H2O(l)E) B2O3 (s) + 6HF(l) → 2BF3 (g) + 6H2O(l)
What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers?
___ Na + ___ H2O → ___ NaOH + ___ H2
A) 1
B) 2
C) 3
D) 4
E) 5
What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers?
___ Al4C3 + ___ H2O → ___ Al(OH)3 + ___ CH4
A) 3
B) 4
C) 6
D) 12
E) 24
What is the stoichiometric coefficient for oxygen gas (O2) when the following equation is balanced using the lowest, whole-number coefficients?
_____C3H8(g) + _____ O2(g) → _____ CO2(g) + _____ H2O(l)
A) 9 B) 7 C) 5 D) 3 E) 1
Write a balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.a. H2SO4 (aq) + LiOH (aq) → H2O (l) + Li 2SO4 (aq)b. H2SO3 (aq) + 2 LiOH (aq) → 2 H 2O (l) + Li2SO3 (aq)c. HSO3 (aq) + LiOH (aq) → H 2O (l) + LiSO3 (aq)d. HSO4 (aq) + LiOH (aq) → H 2O (l) + LiSO4 (aq)e. H2S (aq) + 2 LiOH (aq) → 2 H 2O (l) + Li 2S (aq)
When hydrogen peroxide (H2O2) decomposes, it forms oxygen and hydrogen gas:
____ H2O2 → _____ O2 + _____ H2O
When this equation is balanced, what is the coefficient for oxygen?
a. 1
b. 2
c. 3
d. 4
Write the chemical formulas for the following reaction. Do not worry about balancing or states:Sulfurous acid reacts with barium hydroxide to form water and barium sulfite.
After balancing the following reaction, what are the coefficients for H 2O and NaAu(CN)2, respectively?
__ Au + __ NaCN + __ O2 + __ H2O → __ NaAu(CN)2 + __ NaOH
A) 1, 3
B) 2, 4
C) 1, 4
D) 3, 2
E) 3, 1
Balance the following equation and select the correct coefficients for NO2 and N2, respectively:
__ NH3 (g) + __ NO2 (g) → __ N2 (g) + __ H2O (l)
a) 3, 5
b) 5, 9
c) 4, 3
d) 6, 7
e) 7, 9
Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.A) Al(C2H3O2)2(aq) + (NH4)2PO4(aq) → AlPO4(s) + 2 NH4C2H3O2(aq)B) Al(C2H3O2)2(aq) + (NH3)2PO4(aq) → AlPO4(s) + 2 NH3C2H3O2(aq)C) Al(CO3)2(aq) + (NH3)2PO4(aq) → AlPO4(s) + 2 NH3CO3(aq)D) Al(C2H3O2)3(aq) + (NH4)3PO4(aq) → AlPO4(s) + 3 NH4C2H3O2(aq)E) Al(CO2)3(aq) + (NH4)3PO3(aq) → AlPO3(s) + 3 NH4CO2(aq)
The reaction of calcium with elemental chlorine yields calcium chloride. Write a balanced chemical equation for this reaction.a) Ca(s) + Cl2(g) → CaCl(s) + Cl(g)b) Ca(s) + Cl2(g) → CaCl2(s)c) Ca(s) + 2 Cl2(g) → CaCl4(s)d) 2 Ca(s) + Cl2(g) → 2 CaCl(s)e) 4 Ca(s) + Cl2(g) → 2 Ca2Cl(s)
Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phospate and aqueous ammonium acetate.A) Al(C2H3O2)2(aq) + (NH3)2PO4(aq) → AlPO4(s) + 2NH3C2H3O2(aq)B) Al(C2H3O2)2(aq) + (NH4)2PO4(aq) → AlPO4(s) + 2NH4C2H3O2(aq)C) Al(CO2)3(aq) + (NH4)3PO3(aq) → AlPO3(s) + 3NH4CO2(aq)D) Al(C2H3O2)3(aq) + (NH4)3PO4(aq) → AlPO4(s) + 3NH4C2H3O2(aq)E) Al(CO2)3(aq) + (NH3)2PO4(aq) → AlPO4(s) + 2NH3CO3(aq)
When the chemical equation
FeS + O2 → FeO + SO2
is balanced with the smallest integral coefficients, the coefficient of O 2 is:
a. 3
b. 2
c. 4
d. 8
e. 5
When the chemical reaction representing the complete combustion of acetic acid, C2H4O2, is balanced with the smallest integer coefficients, the sum of the coefficients in the balanced equation is:
A. 9
B. 7
C. 2
D. 4
E. 5
What is the coefficient of O 2 when the following equation is properly balanced with the smallest set of whole numbers?
C3H7OH(I) + O2(g) → CO2 + H2O
A) 5
B) 17
C) 9
D) 6
E) 2
The following equation is not balancedCaSO4 + AlCl3 → CaCl2 + Al2(SO4)3What number should be placed in front of CaSO 4 to give the same total number of sulfate ions on each side of the equation?
Examine the following unbalanced chemical equation: CO2 + C → COWhich of the following is the correctly balanced form of this equation? a. CO2 + C → C2O b. CO2 + C → 2CO c. 2CO2 + C → CO d. CO2 + C2 → CO
Which one of the following chemical equations is balanced? a. 2Na + S → 2NaS b. NH3 + H2O → 2NH4OH c. KOH + H2SO4 → KHSO4 + H2O d. 2NaCl + H2SO4 → HCl + NaSO4
A loud classroom demonstration involves igniting a hydrogen-filled balloon. The hydrogen within the balloon reacts explosively with oxygen in the air to form water. If the balloon is filled with a mixture of hydrogen and oxygen, the explosion is even louder than if the balloon is filled only with hydrogen, and the intensity of the explosion depends on the relative amounts of oxygen and hydrogen within the balloon. Look at the following molecular views representing different amounts of hydrogen and oxygen in four different balloons.Based on the balanced chemical equation, which balloon will make the loudest explosion?
Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.A) Al(C2H3O2)2 (aq) + (NH4)2PO4 (aq) → AlPO4 (s) + 2 NH4C2H3O3 (aq)B) Al(C2H3O2)2 (aq) + (NH3)2PO4 (aq) → AlPO4 (s) + 2 NH3C2H3O3 (aq)C) Al(CO3)2 (aq) + (NH3)2PO4 (aq) → AlPO4 (s) + 2 NH3CO3 (aq)D) Al(C2H3O2)3 (aq) + (NH4)3PO4 (aq) → AlPO4 (s) + 3 NH4C2H3O3 (aq)E) Al(CO2)3 (aq) + (NH4)3PO3 (aq) → AlPO3 (s) + 3 NH4CO2 (aq)
When the chemical equation below is balanced with the smallest INTEGER coefficients, the sum of the coefficients is:(H3C)2PCH2N(CH3)2 + O2 → CO2 + H3PO4 + N2 + H2Oa. 13b. 91c. 35d. 41e. 33
Automobile airbags inflate due to the formation of nitrogen gas from the following chemical reaction. 2NaN3 (s) → 3N2 (g) + 2Na (s) Identify the number of each atom in the reactants and products for this balanced reaction.