Help with chemistry plz its urgent

Question

1-Nitrogen dioxide and water react to produce nitric acid, HNO3, and nitrogen oxide.

                               3NO2 + H2O --> 2HNO3 + NO

2- How many grams of H2O are needed to produce 45g of NO?.

3 -Using the equation below, calculate the number of grams of N2 that are formed from the reaction of 21 grams of NH3.

                                                               4NH3   +  3O2 --> 2N2 + 6H2O

Answer 1

2)

45g NO x (1 mol / 30.01g) = 1.50 mol NO

1.5 mol NO x (1 mol H₂O / 1 mol NO) = 1.5 mol H₂O

1.5 mol H₂O x (18.01g / 1 mol) = 27.015g H₂O

3)

23g NH₃ x (1 mol/ 17.031g) =1.35 mol NH₃

1.35 mol NH₃ x (2 mol N₂ / 4 mol NH₃) = 0.675 mol N₂

0.675 mol N₂ x (28.01g/ 1 mol) = 18.91g N₂

Answer 2

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