Calculate the density of a block of aluminum that occupies a volume of 15.0 mL and has a mass of 40.5 g. Make sure your answer has the correct units.
D=M/V

Thus, the block of aluminum has a density of 2.70 g/mL.

Explanation:

Density = mass/volume

40.5g / 15.0gl = 2.70g/ml

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.