N2 (g)+3h2 (g)=2nh3 (g) removing hydrogen from the equilibrium system

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

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?

In 2002, the rare earth elements mine in mountain pass, california was closed because