Which do you NOT need to know when finding the volume of a gaseous reactant or product in a reaction? Help

What material does not melt at any temperature

Will mark brainliest how many electrons can be held in the energy level n = 4?

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?