COLLIGATIVE PROPERTY CHEMISTRY

Question

Which compound will have the lowest impact in the colligative property? Why?

A. 3 mol CaCl2

B. 3 mol C6H12O6

C. 3 mol NaCl

D. Both A and B

Answer 1

The key here is to determine the total number of moles of ions formed for each of the possible answer choices. Let's go one by one.

A: Since each mole of CaCl2 has a total of 3 moles of ions, 3 mol CaCl2 yields 9 mol ions

B: Since C6H12O6 does not dissociate into any ions, 3 mol C6H12O6 yields 3 mol ions

C: Since each mole of NaCl yields 2 mol ions, 3 mol NaCl yields 6 mol ions

Since B gave us the smallest number of ions, it will have the lowest impact on colligative properties.