How do the population in a community depend on each other

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?

The chemical formula for emerald is be3al2(sio3)6.an emerald can be decided as

What happens to acetone molecules when you add heat to a beaker of liquid acetone?