What is the chemical equation for ethyl alcohol?

Can someone me with questions 12 and 13 plz.

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

What is the main reason why some developing countries fear the increase the free trade policies around the world?