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

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.

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:

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.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

what is the question?