Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 ∘C, the vapor pressure of pure benzene is 100.84 Torr. What is the vapor pressure of a solution made from dissolving 11.5 g of biphenyl in 31.9 g of benzene?

Explanation:

Raoult's law is a tool that allows to determine vapour pressure of solutions. The formula is:

(1)

Where

P is Pressure of solution and solvent and X is mole fraction.

Moles of solute and solvent are:

Biphenyl:

11.5g×(1mol /154.21g) = 0.0746mol

Benzene

31.9g×(1mol /78.11g) = 0.408mol

Mole fraction of benzene is:

= 0.846

Replacing in (1):

I hope it helps!

there is none because earth is stationary and flat.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72