No, your answer is incorrect. To find the mass of a bar of aluminum, you need to multiply its volume by its density.
Volume = Length * Width * Height
Volume = 3.8 cm * 3.6 cm * 14.8 cm = 179.872 cm^3
Mass = Volume * Density
Mass = 179.872 cm^3 * 2.7 g/cm^3 = 485.179 g
Therefore, the mass of the aluminum bar is 485.179 grams