13. A 800.0 L sample of drinking water is found to contain 2.00 mg of arsenic. What is the concentration(in M) of arsenic in the sample?А: 3.34 х 10-814. A 50.0 g sample of SAE 15W-40 motor oil is sent for testing. It was found to contain 13.4 ug of lead.What is the concentration (in M) in the oil? (doil0.87 g mL-)A: 1.1 х 10 672Chemistry I© 2020 F'20/S'21 NetID:Name:15. What volume (in mL) of a 10.0 M stock solution of aqueous magnesium bromide is required tomake a 500. mL 0.250 M solution?А: 12.516. An aliquot of a 8.50 M stock aqueous solution of sodium chloride is used to create 800. mL of a0.100 M dilute solution. What is the mass (in g) of sodium chloride present in the dilute solution?A: 4.6817. Determine the formula mass (in amu) for the following compounds:(a) NaOH(b) CH3COOH(c) C10H10FE(d) MgSO4A: 40.00; 60.06; 186.05; 120.38

Answered: 13. A 800.0 L sample of drinking water…

13. A 800.0 L sample of drinking water is found to contain 2.00 mg of arsenic. What is the concentration (in M) of arsenic in the sample?

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter13: The Chemistry Of Solutes And Solutions

Section: Chapter Questions

Problem 57QRT

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Question

13. A 800.0 L sample of drinking water is found to contain 2.00 mg of arsenic. What is the concentration
(in M) of arsenic in the sample?
А: 3.34 х 10-8
14. A 50.0 g sample of SAE 15W-40 motor oil is sent for testing. It was found to contain 13.4 ug of lead.
What is the concentration (in M) in the oil? (doil
0.87 g mL-)
A: 1.1 х 10 6
72
Chemistry I
© 2020 F'20/S'21

NetID:
Name:
15. What volume (in mL) of a 10.0 M stock solution of aqueous magnesium bromide is required to
make a 500. mL 0.250 M solution?
А: 12.5
16. An aliquot of a 8.50 M stock aqueous solution of sodium chloride is used to create 800. mL of a
0.100 M dilute solution. What is the mass (in g) of sodium chloride present in the dilute solution?
A: 4.68
17. Determine the formula mass (in amu) for the following compounds:
(a) NaOH
(b) CH3COOH
(c) C10H10FE
(d) MgSO4
A: 40.00; 60.06; 186.05; 120.38

Expert Solution

Step 1

Molarity = number of moles of solute/volume of solution (in L)

Number of moles = mass/molar mass

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