. If 1 cm3 of iron has a mass of 7.52 g, what is the mass of an iron bar of rectangular cross section with the dimensions shown?

Question

height=3.2cm

breadth=1.7cm

width=120cm

 

plz show working

Answer 1

Find the volume of the bar:

3.2cm x 1.7cm x 120 cm = 652.8 cm³

 

Find the mass:

652.8 cm³ x 7.52g/cm³ = 4909 g = 4900 g (to 2 sig figs)