Question

Metal Density (g/cm3)
aluminum 2.70
zinc 7.14
iron 7.87
copper 8.96
silver 10.49
lead 11.34
mercury 13.55
gold 19.32
26
What is the identity of a sample that has a mass of 25.0 g and a volume of 2.38 cm3?
A.
aluminum
B.
silver
C.
lead
D.
iron

Answer 1

To find the identity of the sample, we can calculate its density using the formula:

\[
\text{Density} = \frac{\text{Mass}}{\text{Volume}}
\]

Given:
- Mass = 25.0 g
- Volume = 2.38 cm³

Calculating the density:

\[
\text{Density} = \frac{25.0 \, \text{g}}{2.38 \, \text{cm}^3} \approx 10.50 \, \text{g/cm}^3
\]

Now we can compare this calculated density with the densities of the metals provided:

- Aluminum: 2.70 g/cm³
- Zinc: 7.14 g/cm³
- Iron: 7.87 g/cm³
- Copper: 8.96 g/cm³
- Silver: 10.49 g/cm³
- Lead: 11.34 g/cm³
- Mercury: 13.55 g/cm³
- Gold: 19.32 g/cm³

The calculated density of approximately 10.50 g/cm³ is very close to the density of silver (10.49 g/cm³).

Therefore, the identity of the sample is:

**B. silver**