Question

part d: practice problems – balance each equation using the process from part c.
cl₂ + nabr → nacl + br₂ h₂ + n₂ → nh₃

na + br₂ → nabr cucl₂ + h₂s → cus + hcl

hgo + cl₂ → hgcl + o₂ c + h₂ → ch₄

challenge problem: give it your best shot!
c₂h₆ + o₂ → co₂ + h₂o

Explanation:

Step1: Balance first equation

Count atoms: Cl₂ + 2NaBr → 2NaCl + Br₂

Step2: Balance second equation

Count atoms: 3H₂ + N₂ → 2NH₃

Step3: Balance third equation

Count atoms: 2Na + Br₂ → 2NaBr

Step4: Balance fourth equation

Count atoms: CuCl₂ + H₂S → CuS + 2HCl

Step5: Balance fifth equation

Count atoms: 2HgO + Cl₂ → 2HgCl + O₂

Step6: Balance sixth equation

Count atoms: C + 2H₂ → CH₄

Step7: Balance challenge equation

Count atoms: 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

Answer:

Cl₂ + 2NaBr → 2NaCl + Br₂
3H₂ + N₂ → 2NH₃
2Na + Br₂ → 2NaBr
CuCl₂ + H₂S → CuS + 2HCl
2HgO + Cl₂ → 2HgCl + O₂
C + 2H₂ → CH₄
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O