Question

A) The vapor pressure of an aqueous solution of potassium bromide at 31 °C is 0.04173 atm. The vapor pressure of pure water at the same temperature is 0.04434 atm. Estimate the freezing point of the solution. For water, Kfp = 1.86 °C/m. Answer:_____ °C

B)
Complete combustion of 3.769 g of a compound of carbon, hydrogen, and oxygen yielded 8.120 g CO₂ and 3.325 g H₂O. When 13.90 g of the compound was dissolved in 253 g of water, the freezing point of the solution was found to be -0.998 °C. For water, K_fp = 1.86 °C/m. What is the molecular formula of the compound?

• Enter the elements in the order C, H, O
  Answer:

  molecular formula =

  ______

Answer 1