have no charge. They are found in the and provide or weight to the element. The number can vary in an element’s atoms. This results in like carbon which has 12 C and 14 C. Both of these atom forms have the same number of protons which is but a different number of .

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?