Question

You take three 20.0mL samples of KHP and find the average moles per mL to be 0.00206. What would the total moles of KHP be if the intial volume was 100.0 mL?

Answer 1

Do you mean each of the three 20 ml samples taken for analysis is from the same (100 ml) stock solution of KHP. This question is answered on that basis.

Average moles of KHP per ml of the solution = 0.00206

This means that 1 ml of the solution contains 0.00206 moles

Initial volume of the solution = 100 ml

Total moles of KHP in 100 ml of the solution = 100 ml x 0.00206 moles/ml = 0.206 moles.

Note; Even if 20 ml is taken for analysis , concentration is reported as moles per ml. Hence no need to consider 20 ml in calculation