Question

5. A salvage operator recovered coins believed to be gold. A sample weighed 129.6 g and had a volume of 15.3 cm3. Were the coins gold (d= 19.3 g/cm3) or just yellow brass (d= 8.47 b/cm3)?

Answer 1

Answer:

Therefore the coins were of yellow brass.

Explanation:

A sample weighted 129.6 g and had a volume of 15.3 cm³.

$Density =\frac{mass }{volume}$

Here mass= 129.6 g and volume =15.3 cm³.

$Density =\frac{129.6}{15.3}$ g/cm³

             =8.47 g/cm³

Given that the density of gold = 19.3 g/cm³

and density of yellow brass = 8.47 g/cm³

Since the density of the sample is equal to the density of yellow brass.

Therefore the coins were of yellow brass.