Question

The densities of the coinage metals (copper, silver and gold) are as follows: copper = 8.95 g/cm3 silver = 12.59 g/cm3 gold = 19.32 g/cm3 A sample of material is found to weigh 15.12 grams and have a volume of 1.20 cm3. What is the calculated density? The sample is most likely which of the coinage metals listed above? a. copper b. silver c. gold

Answer 1

1. The calculated density of the sample is 12.6 g/cm³

2. The sample is silver (option B)

Definition of density

The density of an object is defined as the mass of the object per unit volume of the object. Mathematically is expressed as:

Density = mass / volume

1. How to determine the density

• Mass = 15.12 g
• Volume = 1.20 cm³
• Density =?

Density = mass / volume

Density = 15.12 / 1.20

Density = 12.6 g/cm³

2. How to determine the sample

• Density of copper = 8.95 g/cm³
• Density of silver = 12.59 g/cm³
• Density of gold = 19.32 g/cm³
• Calculate density = 12.6 g/cm³
• Sample =?

From the above we can see that the calculated density is the approximate density of silver.

Therefore, the sample is silver

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