Has food made us healthier the last 50 years ?

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?

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?