A 0.0182g sample of an unknown substance was dissolved in 2.135g of benzene. Molality of solution is 0.0698m. What is the molecular mass of unknown?

Question

chmvijay · Answer

122.75 is molecular weight

anonymous · Answer

How did you get that?

chmvijay · Answer

is it right

anonymous · Answer

Can you show your work? I need to understand how you got the answer.

chmvijay · Answer

Molality = moles of solute(n)/ gram of solvent(GS)
but moles of solute = gram of solute(G) /molecular weight of solvent(M) 
  molality =(G/M) /GS
except M you know all the things

chmvijay · Answer

final answer you have to multiply by 1000 bcoz you are doing it molality thats why