Question

If the density of a solution is 3.12 g mL^–1, the mass of 1.5 mL solution in significant figures is ______.

Options

• 4.7 g

• 4680 × 10^–3 g

• 4.680 g

• 46.80 g

Answer 1

If the density of a solution is 3.12 g mL^–1, the mass of 1.5 mL solution in significant figures is 4.7 g.

Explanation:

Density of a solution = `"Mass of solution"/"Volume of solution"`

3.12 g mL^–1 = `x/(1.5  mL)`

∴ `x = 3.12 xx 1.5`

`x` = 4.68 g

The number of significant figures in the product of a multiplication or division should equal the number of figures in the calculation's least precise phrase. This term's degree of precision is 1.5.

As a result, the needed response should include two significant figures.

4.68 g, for example, should be rounded up to 4.7 g.