Answer:
This assumption is incorrect as the volume that is occupied by the air is decreasing as the flask is not completely airtight. Also, the volume starts decreasing as the ethanol is injected into the flask.
Step-by-step explanation:
To calculate the air pressure, the volume occupied by the air is assumed constant. This assumption is incorrect as the volume that is occupied by the air is decreasing as the flask is not completely airtight. As a result, the air pressure values wouldn't be exact. As the volume decreases, vapor pressure also decreases. Also, the volume starts decreasing as the ethanol is injected into the flask.