well i think i got it

based on the half reaction, there are 5 times as many Cl- ions as there are MnO4- ions.

therefore there are 5 times as many moles of NaCl than there are moles of KMnO4.

5 x .00136=.0068moles NaCl

.0068moles NaCl/.0186L NaCl=.372M NaCl

is this correct logic?