The triangle H for a reaction is -990 kj

endothermic
exothermic

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?

What type of energy conversion occurs when you place your feet near the fire place and they become warm

If 2 molecules of one reactant combine with 3 molecules of another to produce 5 molecules of a product, then what is the representation of the reaction?