What is the pressure pf the sample of the gas trapped un the open tube mercury manometer shown if the atmopheric pressure is 740 mmhg abd h is 12.4

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?

How are isotopes of the same chemical element alike? how are they different?

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