Why does a piece of cork float in water? (2 points) the cork is less dense than the water. the cork has less mass than a molecule of water. the water has more volume than the cork. the water weighs more than the cork.

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?