How do you make conclusion

Sum up whatever you wrote into one short paragraph.

Explanation:

Include a brief summary of the paper's main points.

Ask a provocative question.

Suggest results or consequences.

Avoid:

Ending with a rephrased thesis statement that contains no substantive changes.

Introducing a new idea or subtopic (although you may end with a provocative question)

Focusing on a minor point in the essay.

Concluding with a sentence tacked on to your final point.

Apologizing for your view by saying such things as "I may not be an expert" or "At least this is my opinion."

Attempting to make up for an incomplete structure. (If you say you will discuss four books and only attempt a complete discussion of two books, do not try to cover the remaining texts in a concluding paragraph. In such a situation, it's best to limit your paper to topics you can realistically cover.)

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !