Answer: 0.217 mol
Explanation:
To find the amount of moles in a 10 g sample, we need the molar mass of ethanol.
Molar Mass: 46.07 g/mol
Now that we have the molar mass, we can find moles.

We know that there are 0.217 mol in a 10.0 gram sample.
If you increase the volume the pressure will decrease. so the best answer is C
Get an equal amount of each element by adding coefficients to the different compounds.