A student needs to prepare an aqueous solution of sucrose at a temperature of20o C with a vapor pressure of 15.0 mm Hg. How many grams of sucrose (mm =342 g/mol) does she need if she uses 375 g H2O? (The vapor pressure of waterat 20o C is 17.5 mm Hg.)

List four observations that indicate that a chemical reaction may be taking place

How many moles of oxygen react with 12 moles of aluminum

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .