solve with work shown?

6. The density of an irregular piece of rock was to be determined by water displacement method. A 15.28-g of the rock was placed into a cylinder with water level at 35.0mL. The rock does not float. The final water level in the cylinder was recorded to as 39.9mL. Determine the volume and density of the rock. 7. The density of ethanol is 0.789g/mL. What is the mass of 750mL ethanol in grams and kilograms? 8. The urine of an individual suffering from chronic kidney disease has a density of 1.205 g/mL. If the density of water is 0.998g/mL. Calculate the specific gravity of the patient's urine