Chance card in monopoly
The idea is, that you move clockwise (the normal direction) on the board until you reach your destination. If you passed Go, you collect the $200. If you did not pass Go, you did not collect $200.

In your case:

You are on Mayfair, rolled 8 and land on Chance. You passed Go, so you collect $200. Next the card sends you to Pall Mall. In this case, you did not pass Go, so you did not collect (another) $200.



And of course, you need to stop when you reach the destination for the first time (you can not go around the board several times to collect several times $200 ;-) ).