1-4 show all work! List the CAS number and hazards associated with benzophenone,
ID: 480878 • Letter: 1
Question
1-4 show all work! List the CAS number and hazards associated with benzophenone, C_13H_10O. Define the following terms clearly and concisely. molality K_f Solute Salt, NaCl, has a solubility of 35.7 g per 100 g of water at 0 degree C. The solubility of salt in water does not vary appreciably with temperature. NaCl is an electrolyte that is commonly used to melt ice by lowering its melting point. What is the lowest possible melting point for ice that could be obtained considering the solubility of Nacl in water? The K_f for H_2O is 1.86 degree C/m. A 1.2436 g sample of an unknown nonelectrolyte is dissolved in 10.9303 g of benzophenone and produces a solution that freezes at 43.2 degree C. If the pure benzophenone melted at 48.1 degree C, what is the molecular weight of the unknown compound? The K_f for benzophenone is 9.8 degree C/m.Explanation / Answer
CAS Number: 119-61-9
Fire Hazard:
Flash point data for this chemical are not available, but it is probably combustible. (NTP, 1992)
Health Hazard:
Ingestion causes gastrointestinal disturbances. Contact causes eye irritation and, if prolonged, irritation of skin.
2)
a) Molality: It is defined as the number of moles of solute dissolved in 1 Kg of solvent and its unit is mol/Kg or m
b) Kf : it represents the freezing point depression constant.
when some impurity is added to pure solvent, that will change the freezing point and boiling point of the liquid.
Decrease in freezing point is given by T=Kf * m where Kf is the freezing point depression constant and m is the molality.
c) Solute: Solute is the solid particle or liquid which in small quantity is dissolved in a solvent to form solution
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.