How to make a girl happy? (To the two people who will get these free points, please copy the following and paste this in your milk)

If you know, you know...

It's chemistry; what did you expect?

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

If a particle has z = 25 and 23 electrons, what is its charge?

What is the mass of 0.750 mole of aluminum oxide, al2o3?