An Elernmeyer flask is filled to half its volume with an unknown liquid and a magnetic stirring bar is inserted, then the flask is placed on top of a grill with a magnetic stirrer. A rubber stopper is...

An Elernmeyer flask is filled to half its volume with an unknown liquid and a magnetic stirring bar is inserted, then the flask is placed on top of a grill with a magnetic stirrer. A rubber stopper is placed to seal the flask and both the grill and the stirrer are turned on.

Derive the specific energy balance equation for this case and argue the assumptions made.