Please help me with this or I may get an F 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

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes