Hey, please I need help Dessert crêpes are made extra tasty when flambéed with a small amount of cognac. the alcohol in the cognac burns according to the following equation:
CH₃CH₂OH(aq)+O₂= CO₂(g)+H₂O(g)
ethanol
calculate the masses of the remaining compounds in the reaction if 12g of ethanol is used.

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

The organism shown is a free-living one that is anchored to the bottom of ponds and streams during one stage of its life cycle what is the common name for the group to which this organism belong