Need help finding out the math to a chem problem

Question

lengh 10.5cm and width 6.7cm

i need to find the mass of those numbers

Answer 1

You can't find the mass of something that is 2-dimensional. More information is needed for this problem. What is the height of this object? You also need to know the density of this object. Once the height and density is known, you can find the mass.

Let's assume that the height is "1 cm". The area of this object is l x w x h = 10.5 cm x 6.7 cm x 1 cm = 70.35 cm³. 1 cm³ is equal to around 1 mL. So the object has a volume of 70.35 mL. Densities are given in units of g/L. You can use the density as a conversion factor to convert the volume (mL) into grams.