1a. If 20.0 grams of sucrose (C12H22O11) were diluted to 100.0 mL with water, calculate:

- Mass percent

- Molarity

1b. If 42.5 mL of isopropanol (C3H7OH) were added to 95.0 mL of water, calculate:

- Volume percent

- Molarity (the density of isopropanol is 0.786 g/mL)

1c. If 65.7 grams of BaCl2 were dissolved in water, and the total solution volume was 145.0 mL, calculate:

- Molarity of BaCl2

- Molarity of Cl-

1. A 1.189 g sample contains only vitamin C (C6H8O6) and sucralose (C12H19Cl3O8). When the sample is dissolved in water to a total volume of 39.0 mL, the osmotic pressure of the solution is 3.57 atm at 297 K. What is the mass percent of vitamin C and sucralose in the sample?

vitamin C: %

sucralose: %

2. A chemist combined chloroform (CHCl3) and acetone (C3H6O) to create a solution where the mole fraction of chloroform, χchloroform,χchloroform, is 0.187 The densities of chloroform and acetone are 1.48 g/mL and 0.791 g/mL, respectively.

Calculate the molarity of the solution.

molarity: MM

Calculate the molality of the solution.

molality: m

Nature of Science and lab safety What makes one statement or claim science? Along these lines, how do you distinguish a scientific claim from a non-scientific claim, or pseudoscience?

Part A: What mass of silver would plate onto the cathode if a current of 7.7 A flowed through the cell for 64 min ?

t=___ s?

Part B: How much time would it take for 318 mg of copper to be plated at a current of 5.0 A ?

t=___ s?

Part C:What mass of silver would plate onto the cathode if a current of 7.7 A flowed through the cell for 64 min ?

A buffer solution contains 0.444 M NH4Br and 0.365 M NH3 (ammonia). Determine the pH change when 0.084 mol NaOH is added to 1.00 L of the buffer. pH after addition − pH before addition = pH change =

A 12.0M HCl solution has a density of 1.18g/ml. what is the concentration of this solution in the following units?

a) weight percent

b) molality

thank you

Write the balanced NET IONIC equation for the reaction that occurs when nitrous acid and potassium hydroxide are combined.

The extent of this reaction is: .
This reaction is classified as .
A. Strong Acid + Strong Base
B. Weak Acid + Strong Base
C. Strong Acid + Weak Base
D. Weak Acid + Weak Base

A. ... Below 50%
B. ... 50%
C. ... Above 50%
D. ... 100%

Submit Answer

Retry Entire Group

How can the peak area be used to quantitatively analyze a sample using GC?

What is the concentration of hydronium ion, H3O + , in 0.10 M HClO at 25°C?

A. 3.0 × 10−8 M

B. 3.0 × 10−7 M

C. 5.5 × 10−5 M

D. 1.7 × 10−4 M

E. 0.10 M

Define the following concepts and provide an exaple for each: solid-liquid extraction, liquiid-liquid extraction, partition coefficient, miscible solvents, immiscible solvents.

What are two systematic and two random errors present in the experimental procedure?

Remeber how you learned that a pure liquid distills within a narrow boiling point range, but that narrow boiling point doesnt necessarily imple a pure liquid? Keeping that lesson in mind, explain this: you know without a doubt from spectroscopic technique that your product mixture contains 2 distinct products... yet your TLC plate shows only one spot. How is this possible? The, your research advisor tells you thats its really not that unusual to encounter this kind of conflicting data and that it is often easily resolved with a little more bench work. What should you do to clear up the issue using the TLC?

Consider the following question and answer.

Give an example of a homogeneous mixture: "WATER, because it is made up of two different elements - hydrogen and oxygen, and the comeposition is even throughout."

Which aspect of the students answer are correct? Which are incorrect?

7) How many grams of boric acid should be used in compounding the following prescription: (4 points) Rx Lidocaine HCl 1% (E=0.20) Pilocarpine HCl 0.5 % (E= 0.24) Boric acid qs (E=0.52) Purified water ad 60 mL Make isotonic solution Sig: 1 drop in each eye