daniel is conducting an experiment in his chemistry class. he needs to identify which of the following chemical equations is balanced. which one should he choose?
h₂ + o₂ ----- 2h₂o₄
4al + 3o₂ ----- 2al₂o₃
ch₄ + o₂ ----- co₂ + 2h₂o

Question

Accepted Answer

# Explanation:
## Step1: Check hydrogen and oxygen atoms in $H_2 + O_2\to2H_2O$
For hydrogen: Left - hand side has $2$ atoms (from $H_2$), right - hand side has $4$ atoms (from $2H_2O$). For oxygen: Left - hand side has $2$ atoms (from $O_2$), right - hand side has $2$ atoms (from $2H_2O$). The hydrogen atoms are not balanced.
## Step2: Check aluminium and oxygen atoms in $4Al + 3O_2\to2Al_2O_3$
For aluminium ($Al$): Left - hand side has $4$ atoms (from $4Al$), right - hand side has $4$ atoms (from $2Al_2O_3$). For oxygen ($O$): Left - hand side has $6$ atoms (from $3O_2$), right - hand side has $6$ atoms (from $2Al_2O_3$). Both types of atoms are balanced.
## Step3: Check carbon, hydrogen and oxygen atoms in $CH_4+O_2\to CO_2 + 2H_2O$
For carbon ($C$): Left - hand side has $1$ atom (from $CH_4$), right - hand side has $1$ atom (from $CO_2$). For hydrogen ($H$): Left - hand side has $4$ atoms (from $CH_4$), right - hand side has $4$ atoms (from $2H_2O$). For oxygen ($O$): Left - hand side has $2$ atoms (from $O_2$), right - hand side has $4$ atoms ( $2$ from $CO_2$ and $2$ from $2H_2O$). The oxygen atoms are not balanced.

# Answer:
$4Al + 3O_2\to2Al_2O_3$

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QUESTION IMAGE

Question

Explanation:

Step1: Check hydrogen and oxygen atoms in \(H_2 + O_2\to2H_2O\)

Step2: Check aluminium and oxygen atoms in \(4Al + 3O_2\to2Al_2O_3\)

Step3: Check carbon, hydrogen and oxygen atoms in \(CH_4+O_2\to CO_2 + 2H_2O\)

Answer: