How much does a cup of hazelnuts weigh?
Well 1.5 cups is volumetric so the weight will depend on how tightly packed that cup is, if they are chopped, etc.  On average though, 1.5 cups of chopped hazelnuts is about 6.08 oz (172 g) according to the USDA's averages.  You can check the USDA's National Nutrient Database page for hazelnuts if you want to see estimated weights for 1.5 cups of whole, chopped, or ground hazelnuts.