Can someone do these 2 chem questions? i've done everything up until this point and i don't get it.

i put up 50 points so that should be fair enough.

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?

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?

Which statement accurately represents the arrangement of electrons in bohr’s atomic model?