The answer varied by the pepper variety, as every pepper weighs differently.   Approx 180 Carolina Reaper peppers are in 1kg Carolina Reaper pepper mash.
Approx 140 Ghost chili peppers are in 1kg ghost pepper mash.
Approx 100 jalapeno peppers are in 1kg jalapeno pepper mash.
Our Carolina Reaper peppers average 180 fresh peppers per kilogram (2.2 pounds).  Our pepper mash contains 87-90% fresh peppers, 8-11% salt, and 1-3% vinegar.  The retail mash is then heated to stop fermentation activity, which results in a loss of approx 15% weight due to water evaporation.
Therefore, approx 180 peppers are in one kilo of retail mash, approx 5 peppers per ounce.