How many total atoms are in 3 molecules of N2O5?

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

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have