Answer:
first.....lets calculate the molar mass of KClO4
39+35.5+16*4
39+35.5+64
=138.5g/mol
so that mean every mole have 138.5g...got that?
138.5g = 1mole
123g=x mole
123/138.5=x
x=0.888mol
Number of moles = mass /molar mass
= 123 g/ 242.0111 g/mol
= 0.508 mol
Explanation:
