How many neutrons does element x have if its atomic number is 25 and its mass number is 91?

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Which two scientific disciplines are bridged by pharmaceutical drugs? chemistry and forensics chemistry and medicine biology and forensics biology and criminology

We are hoping to create 5.72 grams of glucose. the plant was given 4.75 liters of co2 and 2.81 g of h20. which reactant was the limiting reagent? how much excess mass did we have of the other reactant?