balancing chemical equations

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Balance the equation: _P₄+_O₂ →  _P₂O₃

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1 P₄+ 3 O₂ → 2 P₂O₃

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Balance the equation: _AgNO₃ + _Cu →_Cu(NO₃)₂ + _Ag

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2 AgNO₃ + 1 Cu → 1 Cu(NO₃)₂ + 2 Ag

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Balance the equation: _BaS + _PtF₂ → _BaF₂ + _PtS

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1 BaS + 1 PtF₂ → 1 BaF₂ + 1 PtS

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Balance the chemical equation: _AlBr₃ + _K₂SO₄ → _KBr + _Al₂(SO₄)₃

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2 AlBr₃ + 3 K₂SO₄ → 6 KBr + 1 Al₂(SO₄)₃

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Balance the equation: _SO₂ + _Li₂Se →_SSe₂ + _Li₂O

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1 SO₂ + 2 Li₂Se → 1 SSe₂ + 2 Li₂O

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Balance the equation: _Al + _HCl → _H₂ + _AlCl₃

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2 Al + 6 HCl → 3 H₂ + 2 AlCl₃

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_K + _Cl₂ →_KCl

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2 K + 1 Cl₂ → 2 KCl

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Balance the chemical equation: _NaF + _Br₂ →_NaBr + _F₂

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2 NaF + 1 Br₂ → 2 NaBr + 1 F₂

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Balance this equation: Al₂O₃ ---> Al + O₂

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2Al₂O₃ ---> 4Al + 3O₂

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Balance this equation:  H₂ + N₂ → NH₃

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3H₂ + N₂ → 2NH₃