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5 grams of cayenne pepper is a small amount that measures 0.735 tbsp (10.9 mL). When poured into a loose pile, it is about the size of a grape.

In kitchen measures
2.21 teaspoons
2.21 tsp · 0.735 tbsp · 0.046 cups
about the size of a grape
Cayenne pepper typically ranges 0.42–0.5 g/mL depending on how it's packed. A firmly packed scoop weighs more.