Question

The density for potassium is 0.856 g/cm3. What would be the mass of a 30 cm3 piece of potassium? A. 51.36g B. 25.68g C. 25.5g D. 35.05g

Answer 1

Answer: The mass of given piece of potassium is 25.68 g

Explanation:

Density of a substance is defined as the ratio of its mass and volume. The equation used to determine density follows:

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

We are given:

Density of potassium = $0.856g/cm^3$

Volume of potassium = $30cm^3$

Putting values in above equation, we get:

$0.856g/cm^3=\frac{\text{Mass of potassium}}{30cm^3}\\\\\text{Mass of potassium}=(0.856g/cm^3\times 30cm^3)=25.68g$

Hence, the mass of given piece of potassium is 25.68 g

Answer 2

Density = mass / Volume 0.856 g/cm3 = x / 30 cm3(0.856)(30) = xx = 25.68 grams