Don't even know where to start step wise

Section D: Density as a Conversion factor For the following problems, you must use dimensional analysis to show work: 1. Mercury has a density of 13.6g/mL. What is the mass of a 0.24L sample of mercury? Show your work. 2. Use the following information for part a and b : If the density of butter is 0.86g/mL a. what volume is occupied by 427g of butter? Show your work. b. How heavy would 20, Liters of butter be in decigrams? (hint. Density of butter is above)