How does the excretory and the digestive system work together?

Why does his teacher ask him to balance the equation by including the correct coefficient

Define dew point. i am writing this part to be able to ask the question

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.