Which chemical equations are balanced?

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Which of these chemical equations is balanced?

• N₂ + H₂ → NH₃
• 2 N₂ + H₂ → NH₃
• N₂ + H₂ → 2 NH₃
• N₂ + 3 H₂ → 2 NH₃

Which of these chemical equations is balanced?

• NO₂ + H₂O → HNO₃ + NO
• 3 NO₂ + H₂O → HNO₃ + NO
• 3 NO₂ + H₂O → 2 HNO₃ + NO
• 3 NO₂ + H₂O → 2 HNO₃ + 3 NO

Which of these chemical equations is balanced?

• CaC₂ + H₂O → C₂H₂ + Ca(OH)₂
• CaC₂ + 2 H₂O → C₂H₂ + Ca(OH)₂
• CaC₂ + 2 H₂O → C₂H₂ + 2 Ca(OH)₂
• 3 CaC₂ + H₂O → C₂H₂ + 3 Ca(OH)₂

Which of these chemical equations is balanced?

• Cu₂O + O₂ → CuO
• 2 Cu₂O + O₂ → CuO
• Cu₂O + O₂ → 2 CuO
• 2 Cu₂O + O₂ → 4 CuO

Which of these chemical equations is balanced?

• NH₃+ O₂ → NO + H₂O
• 2 NH₃+ O₂ → 2 NO + H₂O
• 5 NH₃+ 3 O₂ → 4 NO + 6 H₂O
• 4 NH₃+ 5 O₂ → 4 NO + 6 H₂O

Which of these chemical equations is balanced?

• Al + ZnCl₂ → Zn + AlCl₃
• 2 Al + 3 ZnCl₂ → 3 Zn + 2 AlCl₃
• Al + 3 ZnCl₂ → 3 Zn + AlCl₃
• 4Al + 3 ZnCl₂ → 3 Zn + 2 AlCl₃

Which of these chemical equations is balanced?

• CO₂ + H₂O → C₆H₁₂O₆ + O₂
• 2 CO₂ + 2 H₂O → C₆H₁₂O₆ + 6O₂
• 6 CO₂ + 3 H₂O → C₆H₁₂O₆ + 6O₂
• 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6O₂

When this chemical equation is balanced correctly, H₂ + Cl₂ → HCl, what is the correct coefficient in front of HCl?

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