Question

type coefficients in each blank to balance the chemical equations below;
? al + ? hcl → ? h₂ + ? alcl₃
? naf + ? br₂ → ? nabr + ? f₂
? al + ? feo → ? al₂o₃ + ? fe

Explanation:

Step1: Balance the first equation

For \(Al + HCl
ightarrow H_2+AlCl_3\), balance \(Cl\) atoms. Let the coefficient of \(HCl\) be \(6\), then coefficient of \(AlCl_3\) is \(2\). Balance \(Al\) atoms, coefficient of \(Al\) is \(2\). Balance \(H\) atoms, coefficient of \(H_2\) is \(3\).

Step2: Balance the second equation

For \(NaF + Br_2
ightarrow NaBr+F_2\), balance \(Br\) and \(F\) atoms. Let the coefficient of \(NaF\) be \(2\), coefficient of \(Br_2\) be \(1\), coefficient of \(NaBr\) be \(2\), coefficient of \(F_2\) be \(1\).

Step3: Balance the third equation

For \(Al + FeO
ightarrow Al_2O_3+Fe\), balance \(Al\) and \(O\) atoms. Let the coefficient of \(Al\) be \(2\), coefficient of \(FeO\) be \(3\), coefficient of \(Al_2O_3\) be \(1\), coefficient of \(Fe\) be \(3\).

Answer:

\(2Al + 6HCl
ightarrow 3H_2+2AlCl_3\)
\(2NaF + 1Br_2
ightarrow 2NaBr+1F_2\)
\(2Al + 3FeO
ightarrow 1Al_2O_3+3Fe\)