Question

If a sample has a mass of 1.25⋅102 g and a volume of 51 mL, what is its density?

Answer 1

• 2.5 g/ml

Step-by-step explanation:

1) Data:

a) m = 1.25 × 10² g

b) V = 51 ml

d) density = ?

2) Principles and formulae:

Density is a concentration unit that tells the ratio of the mass of a substance to its volume.

• Equation: d = m / V

Where d is the density of the substance, m is the mass, and V is the volume.

3) Solution:

a) Substitute the data into the equation:

• d = m / V = 1.25 × 10² g / 51 ml = 2.45 g/ml.

b) Use the correct number of significant digits: 2.45 g/ml must be rounded to two signficant figures, i.e. to 2.5 g/ml, since the volume was given with two significant digits.