Question

the sabatier reaction is used on space missions to remove carbon dioxide exhaled by the astronauts. it also produces clean drinking water and methane that can be used for fuel. the chemical equation for this reaction is shown below. co₂(g) + 4h₂(g) → 2h₂o(l) + ch₄(g) use the chemical equation to complete the statements. - carbon dioxide (co₂) has a coefficient of 2. - hydrogen (h₂) has a subscript of 4. - methane (ch₄) has a subscript of 4.

Explanation:

Step1: Identify coefficient of CO₂

In the chemical equation $CO_{2}(g)+4H_{2}(g)
ightarrow2H_{2}O(l)+CH_{4}(g)$, the number in front of $CO_{2}$ is 1, not 2. So the statement "Carbon dioxide ($CO_{2}$) has a coefficient of 2" is False.

Step2: Identify sub - script of H₂

The sub - script of hydrogen in $H_{2}$ is 2, not 4. So the statement "Hydrogen ($H_{2}$) has a subscript of 4" is False.

Step3: Identify sub - script of CH₄

In methane $CH_{4}$, the sub - script of hydrogen is 4. So the statement "Methane ($CH_{4}$) has a subscript of 4" is True.

Answer:

• Carbon dioxide ($CO_{2}$) has a coefficient of 2: False
• Hydrogen ($H_{2}$) has a subscript of 4: False
• Methane ($CH_{4}$) has a subscript of 4: True