Question

part 2 determine if the following reactions are balanced, as written. if not, correct them. then classify.

1. ( 4 mathrm{al} cdot 3 mathrm{o}_{2} \to 2 mathrm{al}_{2} mathrm{o}_{3} )
2. ( 2 mathrm{p}_{2} mathrm{o}_{5} \to 2 mathrm{p} cdot 5 mathrm{o}_{2} )
3. ( mathrm{ch}_{4} cdot 2 mathrm{o}_{2} \to mathrm{co}_{2} cdot 2 mathrm{h}_{2} mathrm{o} )
4. ( 2 mathrm{naclo}_{3} \to 2 mathrm{nacl} cdot 3 mathrm{o}_{2} )
5. ( 3 mathrm{koh} cdot mathrm{co}_{3}left(mathrm{po}_{4}

ight)_{2} \to 2 mathrm{k}_{3} mathrm{po}_{4} cdot 3 mathrm{co}(mathrm{oh})_{2} )

Explanation:

Step1: Count atoms on both sides for reaction 19

Left: 4 Al, 6 O. Right: 4 Al, 6 O. Balanced.

Step2: Count atoms on both sides for reaction 20

Left: 4 P, 10 O. Right: 2 P, 10 O. Unbalanced. Correct: \(2P_2O_5
ightarrow 4P + 5O_2\)

Step3: Count atoms on both sides for reaction 21

Left: 1 C, 4 H, 4 O. Right: 1 C, 4 H, 4 O. Balanced.

Step4: Count atoms on both sides for reaction 22

Left: 2 Na, 2 Cl, 6 O. Right: 2 Na, 2 Cl, 6 O. Balanced.

Step5: Count atoms on both sides for reaction 23

Left: 3 K, 3 O, 3 H, 3 Co, 2 P, 8 O. Right: 2 K, 2 P, 8 O, 3 Co, 6 O, 6 H. Unbalanced. Correct: \(6KOH + Co_3(PO_4)_2
ightarrow 2K_3PO_4 + 3Co(OH)_2\)

Answer:

1. Balanced.
2. Unbalanced. Correct: \(2P_2O_5

ightarrow 4P + 5O_2\)

1. Balanced.
2. Balanced.
3. Unbalanced. Correct: \(6KOH + Co_3(PO_4)_2

ightarrow 2K_3PO_4 + 3Co(OH)_2\)