Question

A-potassium
B-lead
C-iron
D-magnesium
E-zinc
​

Answer 1

The unknown substance : Lead

Further explanation

Given

Density of element

mass of unknown substance = 40 g

volume = 3.5 cm³

Required

The density of unknown substance

Solution

Density is the ratio of mass per unit volume

The unit of density can be expressed in g/cm³ or kg/m³

Density formula:

`\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}`

Input the value to find the density of an unknown substance :

ρ = 40 g : 3.5 cm³

ρ = 11.43 g/cm³

If we look at the table, the substance which has a density of 11.43 is Lead