HELP ME with THIS I am time i have a little bit of time and still have more questions

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

Which of these best describes an ionic bond?

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.