Question

Question 36 of 38 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 (As). Therefore, prior to starting construction, the group decides to measure the current level of arsenic in the lake. If a 14.9 cm2 sample of lake water is found to have 178.9 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/cm? concentration: Ppb One of the volunteers suggests hiring an on-site water treatment company to remove the arsenic from the lake. The company claims their process takes 2.18 days to remove 48.00 kg of arsenic from a water source. Calculate the total mass, in kilograms, of arsenic in the lake that the company will have to remove if the total volume of water in the lake is 0.650 km°. total mass: kg Based on the company's claim and the concentration of arsenic in the lake, how many years will it take to remove all of the arsenic from the lake, assuming that there are always 365 days in a year? number of years: уears

Answer 1

Slotion Given tha Simple of at -1.00 9/em dkeast y Qf ate Volume of taton (a) Ma Ss Cancoffon of eni Volume 8-4 ng la.00 6 14.9 As & Concentratíon

Vokome of WateN o.6So m3 s0.650 10 cm)3 Cm3 O.650 -3 la.00 Xto mg Concentranion mg a mass of A senic 3 78 x1oXlo 7800 kg 800 9 Mass ofAecenic )tateg S.60 lemoved fn Qeo day days emoved days 5 60 366.4u dayys 59 60 Yeal 365 days .0039Yea - lo039_yeal No- of ye leired to emove