If 1 mole of hydrazine combusts into the presence of oxygen, how many molecules of water vapor are produced? A: 1.20×10^23 H2O molecules
B: 1.20×10^24 H2O molecules
C: 28g N2 molecules
D: 6.022×10^23 H2O molecules​

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

the answer is true. hope it .