If a substance has a density of 2.5g/mL, what is the mass of .75 mL of it?

What is the most stable monatomic ion formed from nitrogen

What are the 4 phases of matter in order of increasing engery content?

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?