A classmate obtained a clear liquid, but unfortunately did not label it properly. To help identify it, you determine that its melting point (mp) is -22.9 degrees Celcius. If the only clear liqids available in the lab were acetonitrile (mp -45.5 degrees Celcius), benzene (mp 6.0 degrees Celcius), carbon tetrachloride (mp -23.0 degrees Celcius), and cyclohexane (mp 7.0 degrees Cecius), what is the identity of the liquid

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 .