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(Solved) 6 Safari File Edit s Attempts 1 1 Z 1 3 1 4 1 5 1 6 2 7 2 View History Bookmarks Window Help Score 33 I I - Sun 9:49 PM Q @3/7/2017 11:55 PM 075/10


can someone help me with this problem, i can't get the last two right 

6 Safari File Edit s Attempts
1 1
Z 1
3 1
4 1
5 1
6 2
7 2 View History Bookmarks Window Help Score 33
I
I - Sun 9:49 PM Q @3/7/2017 11:55 PM 075/10 4. <5 i. £1 .
995M 103 *§Efi“_§171°mi"!5§‘ ewes? ,, . saplinglearningcom Q Print Calculator :4, Periodic Table Questlon 3 of 7 Incorrect ’ a Macmillan learning Suppose a roup of volunteers is planning on building a park near a local lake. The lake is known to
contain low evels of arsenic (As). Therefore, prior to starting construction, the group decides to measure
the current level of arsenic in the lake. a) If a 10.3 cm3 sample of lake water is found to have 179.5 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/cma'.7 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 236 days to remove 40.20 kg of As from a water source. b) Calculate the total mass (in kg) of arsenic in the lake that the company will have to remove if the total
volume of water in the lake is 0.470 kins. Number 6016 kg c) 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? 9 Previous Q Check Answer 6 Next fl Exit ° Assignment Information Available From: 3/4/2017 06:00 All
Due Date: 3/7/201711:55 Pll
Points Possible: to
Grade Category: HW
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