You cannot equate weight directly with length. You need to know the shape and dimensions to find the volume. You then need to know the density and apply it. You also have to convert units after that.
750 millimeters = 7.5 decimeters
750 millimeters = 75 centimeters
Ounces are weight, and millimeters are length.
750 grams = 26.45 ounces.
750 inches = 19050 millimeters
75 centimeters are in 750 centimeters.
750 milliliters is 25.36 fluid ounces.
That is 26.455 ounces
750 milliliters = 25.3605169 US fluid ounces
750 millimeters is 2 feet and 5.53 inches.
750 mL equates to approximately 25.4 fluid ounces.
About 25.361 US fluid ounces.