3: Chemical Reactions - Chemistry LibreTexts

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Balancing Equations

Exercise \(\PageIndex{3a}\)

Balance the following equations

  1. PCl5(s)+H2O(l) → POCl3(l)+HCl(aq)
  2. Cu(s)+HNO3(aq) → Cu(NO3)2(aq)+H2O(l)+NO(g)
  3. H2(g)+I2(s) → HI(s)
  4. Fe(s)+O2(g) → Fe2O3(s)
Answer a

PCl5(s)+H2O(l)→POCl3(l)+2HCl(aq)

Answer b

3Cu(s)+8HNO3(aq)→3Cu(NO3)2(aq)+4H2O(l)+2NO(g)

Answer c

H2(g)+I2(s)→2HI(s)

Answer d

4Fe(s)+3O2(g)→2Fe2O3(s)

Exercise \(\PageIndex{3b}\)

Balance the following equations

  1. Na(s)+H2O(l) → NaOH(aq)+H2(g)
  2. (NH4)2Cr2O7(s) → Cr2O3(s)+N2(g)+H2O(g)
  3. P4(s)+Cl2(g) → PCl3(l)
  4. PtCl4(s) → Pt(s)+Cl2(g)
Answer a

2Na(s)+2H2O(l) → 2NaOH(aq)+H2(g)

Answer b

(NH4)2Cr52O7(s) → Cr2O3(s)+N2(g)+4H2O(g)

Answer c

P4(s)+6Cl2(g) → 4PCl3(l)

Answer d

PtCl4(s) → Pt(s)+2Cl2(g)

Exercise \(\PageIndex{3c}\)

Balance the following equations

  1. Ag(s)+H2S(g)+O2(g) → Ag2S(s)+H2O(l)
  2. P4(s)+O2(g)→P4O10(s)
  3. Pb(s)+H2O(l)+O2(g)→Pb(OH)2(s)
  4. Fe(s)+H2O(l)→Fe3O4(s)+H2(g)
Answer a

4Ag(s)+2H2S(g)+O2(g) → 2Ag2S(s)+2H2O(l)

Answer b

P4(s)+5O2(g)→P4O10(s)

Answer c

2Pb(s)+2H2O(l)+O2(g)→2Pb(OH)2(s)

Answer d

3Fe(s)+4H2O(l)→Fe3O4(s)+4H2(g)

Exercise \(\PageIndex{3c}\)

Balance the following equations

  1. Sc2O3(s)+SO3(l)→Sc2(SO4)3(s)
  2. Ca3(PO4)2(aq)+H3PO4(aq)→Ca(H2PO4)2(aq)
  3. Al(s)+H2SO4(aq)→Al2(SO4)3(s)+H2(g)
  4. TiCl4(s)+H2O(g)→TiO2(s)+HCl(g)
Answer a

Sc2O3(s)+3SO3(l)→Sc2(SO4)3(s)

Answer b

Ca3(PO4)2(aq)+4H3PO4(aq)→3Ca(H2PO4)2(aq)

Answer c

2Al(s)+3H2SO4(aq)→Al2(SO4)3(s)+3H2(g)

Answer d

TiCl4(s)+2H2O(g)→TiO2(s)+4HCl(g)

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