which of the following is a correctly balanced equation?
a. naclo3→nacl + 3o2
b. 2hgo→2hg + o2
c. 2zns + o2→2zno + 2so2
d. 4co + fe3o4→4co2 + fe
e. 2fe + 2cl2→2fecl3

Question

Accepted Answer

# Explanation:
## Step1: Check the number of atoms for each element in the equation
For option A: $ \text{NaClO}_3
ightarrow\text{NaCl}+3\text{O}_2 $
- Sodium ($ \text{Na} $): 1 atom on both sides.
- Chlorine ($ \text{Cl} $): 1 atom on both sides.
- Oxygen ($ \text{O} $): 3 atoms on the left ($ \text{NaClO}_3 $) and $ 3\times2 = 6 $ atoms on the right ($ 3\text{O}_2 $). Not balanced.
## Step2: Check option B: $ 2\text{HgO}
ightarrow2\text{Hg}+\text{O}_2 $
- Mercury ($ \text{Hg} $): $ 2 $ atoms on both sides.
- Oxygen ($ \text{O} $): $ 2 $ atoms on the left ($ 2\text{HgO} $) and $ 2 $ atoms on the right ($ \text{O}_2 $). Balanced.
## Step3: Check option C: $ 2\text{ZnS}+\text{O}_2
ightarrow2\text{ZnO}+2\text{SO}_2 $
- Zinc ($ \text{Zn} $): $ 2 $ atoms on both sides.
- Sulfur ($ \text{S} $): $ 2 $ atoms on the left ($ 2\text{ZnS} $) and $ 2 $ atoms on the right ($ 2\text{SO}_2 $).
- Oxygen ($ \text{O} $): $ 2 $ atoms on the left ($ \text{O}_2 $) and $ 2 + 2\times2=6 $ atoms on the right ($ 2\text{ZnO}+2\text{SO}_2 $). Not balanced.
## Step4: Check option D: $ 4\text{CO}+\text{Fe}_3\text{O}_4
ightarrow4\text{CO}_2+\text{Fe} $
- Carbon ($ \text{C} $): $ 4 $ atoms on both sides.
- Oxygen ($ \text{O} $): $ 4 + 4=8 $ atoms on the left ($ 4\text{CO}+\text{Fe}_3\text{O}_4 $) and $ 4\times2 = 8 $ atoms on the right ($ 4\text{CO}_2 $).
- Iron ($ \text{Fe} $): $ 3 $ atoms on the left ($ \text{Fe}_3\text{O}_4 $) and $ 1 $ atom on the right ($ \text{Fe} $). Not balanced.
## Step5: Check option E: $ 2\text{Fe}+2\text{Cl}_2
ightarrow2\text{FeCl}_3 $
- Iron ($ \text{Fe} $): $ 2 $ atoms on both sides.
- Chlorine ($ \text{Cl} $): $ 2\times2 = 4 $ atoms on the left ($ 2\text{Cl}_2 $) and $ 2\times3=6 $ atoms on the right ($ 2\text{FeCl}_3 $). Not balanced.

# Answer:
B. $ 2\text{HgO}
ightarrow2\text{Hg}+\text{O}_2 $

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QUESTION IMAGE

Question

Explanation:

Step1: Check the number of atoms for each element in the equation

Step2: Check option B: \( 2\text{HgO}

Step3: Check option C: \( 2\text{ZnS}+\text{O}_2

Step4: Check option D: \( 4\text{CO}+\text{Fe}_3\text{O}_4

Step5: Check option E: \( 2\text{Fe}+2\text{Cl}_2

Answer: