Question

balance the following chemical equations.

1. cac₂ + ______ h₂o → c₂h₂ + ca(oh)₂
2. ____ ca(oh)₂ + __ h₃po₄ → ca₃(po₄)₂ + ____ h₂o
3. srco₃ + ______ nh₄br → srbr₂ + (nh₄)₂co₃
4. c₇h₁₆ + ____ o₂ → __ co₂ + ____ h₂o
5. ____ c₄h₁₀ + __ o₂ → __ co₂ + ____ h₂o
6. ____ fe + __ o₂ → ____ fe₂o₃

Explanation:

Step1: Balance the first equation

For \(CaC_{2}+H_{2}O
ightarrow C_{2}H_{2}+Ca(OH)_{2}\), balance \(O\) and \(H\) atoms.
\(CaC_{2}+2H_{2}O = C_{2}H_{2}+Ca(OH)_{2}\)

Step2: Balance the second equation

For \(Ca(OH)_{2}+H_{3}PO_{4}
ightarrow Ca_{3}(PO_{4})_{2}+H_{2}O\), balance \(Ca\), \(P\), \(O\) and \(H\) atoms.
\(3Ca(OH)_{2}+2H_{3}PO_{4}=Ca_{3}(PO_{4})_{2}+6H_{2}O\)

Step3: Balance the third equation

For \(SrCO_{3}+NH_{4}Br
ightarrow SrBr_{2}+(NH_{4})_{2}CO_{3}\), balance \(Br\) and \(NH_{4}\) groups.
\(SrCO_{3}+2NH_{4}Br = SrBr_{2}+(NH_{4})_{2}CO_{3}\)

Step4: Balance the fourth equation

For \(C_{7}H_{16}+O_{2}
ightarrow CO_{2}+H_{2}O\), balance \(C\), \(H\) and \(O\) atoms.
\(C_{7}H_{16}+11O_{2}=7CO_{2}+8H_{2}O\)

Step5: Balance the fifth equation

For \(C_{4}H_{10}+O_{2}
ightarrow CO_{2}+H_{2}O\), balance \(C\), \(H\) and \(O\) atoms.
\(2C_{4}H_{10}+13O_{2}=8CO_{2}+10H_{2}O\)

Step6: Balance the sixth equation

For \(Fe + O_{2}
ightarrow Fe_{2}O_{3}\), balance \(Fe\) and \(O\) atoms.
\(4Fe+3O_{2}=2Fe_{2}O_{3}\)

Answer:

1. \(CaC_{2}+2H_{2}O = C_{2}H_{2}+Ca(OH)_{2}\)
2. \(3Ca(OH)_{2}+2H_{3}PO_{4}=Ca_{3}(PO_{4})_{2}+6H_{2}O\)
3. \(SrCO_{3}+2NH_{4}Br = SrBr_{2}+(NH_{4})_{2}CO_{3}\)
4. \(C_{7}H_{16}+11O_{2}=7CO_{2}+8H_{2}O\)
5. \(2C_{4}H_{10}+13O_{2}=8CO_{2}+10H_{2}O\)
6. \(4Fe+3O_{2}=2Fe_{2}O_{3}\)