Question

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the molecular formula for methanol is ch₃oh. which model shows methanol? (black = carbon; red = oxygen; white = hydrogen)

Explanation:

To determine which model represents methanol ($\ce{CH_3OH}$), we analyze the molecular formula and atom color - coding (black = carbon, red = oxygen, white = hydrogen):

Step 1: Analyze the molecular formula of methanol

The formula $\ce{CH_3OH}$ tells us that methanol has 1 carbon atom (C), 4 hydrogen atoms (H), and 1 oxygen atom (O). Let's break down the structure: the carbon is bonded to 3 hydrogens and 1 oxygen, and the oxygen is bonded to 1 hydrogen.

Step 2: Analyze the atom counts by color

• Carbon (black): We need 1 black atom.
• Oxygen (red): We need 1 red atom.
• Hydrogen (white): We need 4 white atoms.

Now let's look at the models:

• The first model (top - left): Let's count the atoms. Black (C): 1, Red (O): 1, White (H): 4. This matches the atom counts for methanol ($\ce{CH_3OH}$).
• The second model (top - right): The number of white (H) atoms does not seem to be 4.
• The third model (middle): It is a space - filling model, but the number of white (H) atoms (represented by the light - colored spheres) does not match 4.
• The fourth model (bottom): The number of white (H) atoms (light - colored spheres) does not match 4.

Answer:

The top - left model (the first model in the grid) shows methanol.