Determine the heat of reaction for the process 2 Fe(s) + 3/2 O2(g) Fe2O3(s) using the information given below: 2 Fe(s) + 6 H2O(l) 2 Fe(OH)3(s) + 3 H2(g) H° = +321.8 kJ H2(g) + 1/2 O2(g) H2O(l) H° = −285.8 kJ Fe2O3(s) + 3 H2O(l) 2 Fe(OH)3(s) H° = +288.6 kJ

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.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.