For water, ebulioscopic constant is ke = 0.52 k dmmol 1 and cryoscopic constant kc = 1.86 k dm' moll, respectively. the 0.710 g sample of na2so4 (mr =142.0) was dissolved in water, so that 250 cm of the aqueous solution was prepared. disregarding the osmotic coefficient, calculate a)-c): a) boiling temperature of the prepared solution at normal pressure. a) 100.03°c; b) freezing temperature of the solution. b)-0.112 °c c) osmotic pressure of the solution (p) at 0°c and 25°c.; p=136 kpa (0°c) and 149 kpa (25°c); d) aqueous solution of kcl with concentration 0.5 mol dm freezes at -1.66°c. calculate the osmotic coefficient (o) of this solution. d) = 0.892

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

In order to calculate the amount of heat transferred you must know the __ and specific heat of the material, as well as the change in temperature. a. volume b. density c. mass d. enthalpy

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: