A mixture of sodium chloride and sodium sulphate is known to contain 0.5 mols of sodium ions and 0.2 mols of chloride ions. How many moles of sulphate ions are present?

answer; i believe that the correct answer is (a) potassium(k)

ill try to . no promises tho.

explanation:

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.