Polycarbonate plastic has a density of 1.2 g/cm3. A photo frame is constructed from
two 5.2 mm sheets of polycarbonate. Each
sheet measures 22 cm by 20 cm.
What is the mass of the photo frame?

The mass of the photo frame : = 549.12 g

Given

a photo frame

two 5.2 mm sheets = 0.52 cm

22 cm by 20 cm dimension

Required

the mass

Solution

The volume of one sheet = l x w x h

= 22 cm x 20 cm x 0.52 cm

= 228.8 cm³

Mass of one sheet :

= density x volume

= 1.2 g/cm³ x 228.8 cm³

= 274.56 g

So for two sheets of polycarbonate :

= 2 x  274.56 g

= 549.12 g

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

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