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 (CaC2) and water react to form acetylene (C2H2) and calcium hydroxide: CaC2(s)+2H2O(g)C2H2(g)+Ca(OH)2(s) In the second step, acetylene (C2H2), carbon dioxide and water react to form acrylic acid (CH2CHCO2H) : 6C2H2(g)+3CO2(g)+4H2O(g)5CH2CHCO2H(g) Suppose the yield of the first step is 81.% and the yield of the second step is 78.%. Calculate the mass of calcium carbide required to make 4.0kg of acrylic acid. Be sure your answer has a unit symbol, if needed, and is rounded to the correct number of significant digits