Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Directions: Read and internalize the short story below and answer the questions that
follow. Complete solution is required.
"The coronavirus disease (COVID-19) is an infectious disease caused by a new strain
of coronavirus. This new virus and disease were unknown before the outbreak began
in Wuhan, China, in December 2019.
On 30 January 2020, the Philippine Department of Health reported the first case of
COVID-19 in the country with a 38-year-old female Chinese national. On 7 March, the
first local transmission of COVID-19 was confirmed. WHO is working closely with the
Department of Health in responding to the COVID-19 outbreak." Aki and her family
were alarmed with the news they watched and so first thing in the morning they rush
to the nearest convenient store to secure disinfectant and sanitizers but unfortunately
the store aiready had empty shelves of the essentials they needed. They went to other
stores searching and to their dismay they acquired nothing. They were on their way
home when she suddenly remembered her past lesson on "solutions", and so she
immediately ran back to the store and purchase the things she needed for her simple
experiment. She bought a bleach (Zonrox), gloves and measuring spoon and cups.
Arriving at home she then put her gloves on and prepared the things she needed such
as; 5tbsp bleach (0.0739L), 1 gallon of water (3.8L), pail and stirring rods. Using the
pail with 3,8L of water, she carefully poured the 5tbsp bleach solution and then mixed
it with the stirring rod. And they now have a disinfectant.
In connection to her home made disinfectant and with our lesson, we will express her
solutions' concentration into, different units; Molarity, Molality, Percent by mass,
Percent by volume, mole fraction and ppm.
Questions:
1. What is the molar concentration of Aki's disinfectant if she dissolved 5Tbsp. of
NACIO (sodium hypochlorite) in 3.8 liters of H20 (water)?
2. Compute for the molality of her disinfectant if she dissolved 5Tbsp. of NaCIo
(sodium hypochlorite) in 3.8 liters of H20 (water).
3. Calculate the percent by mass of sodium hypochorite in her disinfectant solution. (
5Tbsp. of NaCIO (sodium hypochlorite) and 3.8 liters of H20 (water). In units of grams
for both of the solute and solvent.
4. Calculate the mole fraction of sodium hypochorite and water in Aki's solution. (
5Tbsp. of NaCIO (sodium hypochlorite) and 3.8 liters of H20 (water).
5. Calculate the percent by volume of the disinfectant Aki made. Units in mL.
6. What is the concentration of her solution in parts per million? ( 5Tbsp. of NaCIO
(sodium hypochlorite) and 3.8 liters of H2O (water).
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