Does anybody know what a 29" 2117 arrow would weight in grains???

The arrow will have 3 5" feather fletchings...

Im trying to find out if a 100gr broadhead will be to light to shoot with my new bow...
My new bow should be around 45lb at 28"

BW recomends 9-11 grains of arrow weight per lb of draw weight

Thanks for any help!!!