The purpose of controlling certain values so that the values remain the same is to: a. simplify the experimental analysis. b. simplify the experimental procedure. c. decrease the error of an experiment. d. increase the validity of an experiment

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?