PLEASE HELP ME IN BALANCING THIS TWO
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Answers
a)
NaOH (hot) + Cl₂ ➞ NaCl + NaClO₂ + H₂O
Following the standard way of balancing chemical equation, we have:
| Sr. | Element | Reactant | Product |
| 1. | Na | 1 | 2 |
| 2. | Cl | 2 | 2 |
| 3. | O | 1 | 3 |
| 4. | H | 1 | 2 |
From the above data, It is clear that on the reactant side Na is 1 while it must be 2, and vice-versa.
After that, we have:
4NaOH + 2Cl₂ ➞ 3NaCl + NaClO₂ + 2H₂O
b)
Zn + HNO₃ ➞ Zn(NO₃)₂ + N₂O + H₂O
Following the standard way of balancing chemical equation, we have:
| Sr. | Element | Reactant | Product |
| 1. | Zn | 1 | 1 |
| 2. | H | 1 | 2 |
| 3. | N | 1 | 4 |
| 4. | O | 3 | 8 |
After balancing each element on both the sides we have,
2Zn + 6HNO₃ ➞ 2Zn(NO₃)₂ + N₂O + 3H₂O
Why do we balance chemical equations?
Due to the law of conservation of mass which states that mass can neither be created nor destroyed in a chemical reaction, we balance chemical equations so that it follows the law of conservation of mass.