Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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3. Now let's suppose it's your turn to be the professor. You want to write a question for your students using theoretical data. Suppose you want their "unknown liquid" to be toluene (molar mass = 92.1 g/mol). Using the data in the table below, what should the "mass of flask + unknown condensed liquid" be so that they can correctly identify toluene as their unknown?
Mass of flask:
77.485 g
Mass of flask + unknown condensed liquid:
?????
Temperature of water bath:
100 °C
Pressure of gas in our system:
0.997 atm
Volume of gas in our system:
255 mL
Group of answer choices:
A) 78.250
B) 0.765
C) 1.04 g
D) 78.525 g
Blood alcohol content is a measure of alcohol in the blood as a percentage. It is calculated in grams per 100 mL of blood, so a BAC of 0.08 means your blood is 0.08% alcohol by volume.
what is the total mass of alcohol (in grams) that is present for the same adult male whose total blood volume is 5.6L?
II.
BOILING POINT ELEVATION:
The temperature of a boiling 50 mL of distilled water in an Erlenmeyer flask with a small
flame was taken to be 98°C. The bulb of the thermometer must not touch the bottom or sides
of the Erlenmeyer flask.
In another Erlenmeyer flask, 2.83 grams of urea is dissolved in 10 grams of distilled water. The
solution was let to boil gently and its boiling point was recorded to be 101°C.
DATA AND RESULTS: (Show all pertinent computations on the space provided if applicable.
Answers with no computation will not be considered.)
Mass of urea in grams
Mass of water in grams
Boiling point of distilled water in degrees
Celsius
Boiling point of urea solution in degrees
Celsius
Molecular weight of urea in g/mol
(experimental)
Molecular weight of urea in g/mol
(calculated)
Percent Error of Molecular weights of urea
Change in boiling point
SOLUTION/S:
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- 2.97 LDPE has a density in the range of 0.915—0.935 g/cm3, and HDPF has a density in the range of 0.940—0.965 g/cm3. You receive a small disk, 2.0 cm high with a 6.0-cm diameter, from a manufacturer of polyethylene, but its label is missing. You measure the mass of the disk and find that it is 53.8 g. Is the material HDPE or LDPE?arrow_forwardThis year, like many past years, you begin to feel very sleepy alter eating a large helping of Thanksgiving turkey. Some people attribute this sleepiness to the presence of the amino acid tryptophan in turkey. Tryptophan can be used by the body to produce serotonin, which can calm the brains activity and help to bring on sleep. a. What mass in grams of tryptophan is in a 0.25-lb serving of turkey? (Assume tryptophan accounts for 1.0% of the turkey mass.) b. What mass in grams of tryptophan is in 0.25 quart of milk? (Assume tryptophan accounts for 2.0% of milk by mass and that the density of milk is 1.04 kg/L.)arrow_forwardTable salt from the beaker on the left in the photograph is added to water, forming the solution on the right of the photo. If you want to separate the mixture, would the distillation apparatus in figure 2-16 or the filtration apparatus in figure 2-17 be the better choice? Explain.arrow_forward
- On October 21, 1982, the Bureau of the Mint changed the composition of pennies (see Exercise 120). Instead of an alloy of 95% Cu and 5% Zn by mass, a core of 99.2% Zn and 0.8% Cu with a thin shell of copper was adopted. The overall composition of the new penny was 97.6% Zn and 2.4% Cu by mass. Does this account for the difference in mass among die pennies in Exercise 120? Assume the volume of the individual metals that make up each penny can be added together to give the overall volume of the penny, and assume each penny is the same size. (Density of Cu = 8.96 g/cm3; density of Zn = 7.14 g/cm3).arrow_forwardWhich of the following represent physical properties or changes, and which represent chemical properties or changes? You curl your hair with a curling iron. You curl your hair by getting a “permanent wave” at the hair salon. Ice on your sidewalk melts when you put salt on it. A glass of water evaporates overnight when it is left on the bedside table. Your steak chars if the skillet is too hot. Alcohol feels cool when it is spilled on the skin. Alcohol ignites when a flame is brought near it. Baking powder causes biscuits to rise.arrow_forwardYou receive a mixture of table salt and sand and have to separate the mixture into pure substances. Explain how you would carry out this task. Is your method based on physical or chemical properties? Explain.arrow_forward
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