Many tutors have helped me with this question in chemistry homework incorrectly please someone respond and help me as soon as possible please

Question

1.) 3 Cu + 8HNO3 --> 3 Cu(NO3)2   + 2 NO + 4 H2O

In the above equation how many moles of water can be made when 25 moles of HNO3 are consumed?

2.) Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below. 

2NaClO3­ --> 2NaCl +3O2

How many moles of NaClO3­ were needed to produce 44 moles of O2? Round your answer to the nearest whole number.

please help me by explaining and solving please

Answer 1

3 Cu + 8 HNO₃ --> 3 Cu(NO₃)₂   + 2 NO + 4 H₂O

We want to calculate the number of moles of water produced when reacting with 25 moles of HNO₃. In order to do this, we can use the mole ratio that is given to us by the balanced chemical equation. These are the coefficients in front of each specie in the equation. The only thing to take into account is that units that are diagonal from each other when multiplying cancel.

25 mol HNO₃ * (4 mol H₂O / 8 mol HNO₃) = 12.5 mol H₂O

2 NaClO₃ ---> 2 NaCl + 3 O₂

The same explanation applies. If we want to make 44 moles of O₂, then we just start with that and use the ratio, cancelling along the diagonal, and multiplying to get our answer.

44 mol O₂ * (2 mol NaClO₃ / 3 mol O₂) = 29.33 mol NaClO₃