Suppose a group of volunteers is planning to build a park near a local lake. the lake is known to contain low levels of arsenic (). therefore, prior to starting construction, the group decides to measure the current level of arsenic in the lake. if a 14.3 cm314.3 cm3 sample of lake water is found to have 159.5 ng as,159.5 ng as, what is the concentration of arsenic in the sample in parts per billion (ppb), assuming that the density of the lake water is 1.00 g/cm3? 1.00 g/cm3?

The concentration of arsenic in the sample in parts per billion (ppb) is 11.1538 .

Explanation:

Density of the lake water =

Amount of arsenic in 14.3 of water = 159.5 ng =

Mass of the lake water:

Concentration in parts per billion:

parts per billion

The concentration of arsenic in the sample in parts per billion (ppb) is 11.1538.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.