What’s the independent and dependent variable?

How many atoms are in 2 moles of phosphorus

Asolution is made by dissolving 2.3 moles of sodium chloride (nacl) in 0.155 kilograms of water. if the molal boiling point constant for water (kb) is 0.51 °c/m, what would be the boiling point of this solution? show all the steps taken to solve this problem.

The independent variable in an experiment will be the variable that you o a) change ob) hold constant ng c) observe for changes