Compound form of lithium and selenium

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?

How many moles are in 123.0 grams of kclo4?

Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)