In a lab , the average measured density for Pre- 1982 pennies was 7.98g/cm3 . Given that the literature value for the density is 8.92 g/cm3 , calculate the percent error .

law of conservation of matter

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.