What is the difference between ground state and excited state in chemistry?

Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation: 3no2(g)+h2o(l)→2hno3(l)+no(g) part a suppose that 4.2 mol no2 and 0.50 mol h2o combine and react completely. which reactant is in excess? express your answer as a chemical formula. nothing

Answer explain why it is not possible to deduce a complete order of reactivity.

How many moles are in 43.9 l of oxygen