Question

Iron has a density of 7.9 g/cm3. How much mass is in a 10 cm3 sample of iron?

Answer 1

7.9 g/cm3 means that iron weighs 7.9 grams per cubic centimeter. Ten cubic centimeters of iron would weigh ten times as much as one cubic centimeter or iron, or 79 grams.

Answer 2

Answer: The mass of iron is 79 grams.

Explanation:

To calculate mass of a substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

We are given:

Density of iron = $7.9g/cm^3$

Volume of iron= $10cm^3$     (Conversion factor: $1cm^3=1mL$  )

Putting values in above equation, we get:

$7.9g/cm^3=\frac{\text{Mass of iron}}{10cm^3}\\\\\text{Mass of iron}=79g$

Hence, the mass of iron is 79 grams.