It depends what you mean by ounces. There are fluid ounces which measure volume. One cup is 8 fluid ounces. Ounces is also a measurement of mass. If you are talking about volume (fluid ounces), then 3/4 cup of chocolate equals 6 oz. If you are talking about the mass of the chocolate then you have to determine the density (mass per unit volume) of the chocolate and do some more math.
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