How much water should be added to 5.00 g of KCI to prepare a 0.500 M solution?
Rearrange for V to give
Number of moles of KCl is the mass divided by the molar mass of KCl which is 75.5 g/mol, so (5/75.5) = 0.0667 moles.
Now plug in the numbers:
So you need to add 0.1334 litres of 133.4
(NB: symbol for molarity is upper case M. m is metres).