General Chemistry Answers

A 5.20 M sugar solution is diluted from 240.0 mL to 875.0 mL. What is the concentration of the dilute solution?

A chemist has a 310.0 mL solution of sodium bisphosphate with a concentration of 3.00 M. The diluted concentration should be 0.5500 M. What is the final volume of this solution?

A 2.5 M solution has an initial volume of 150.0 mL. The solution is diluted to a final volume of 300.0 mL. What is the new concentration?

Find the oxidation number of each atom in the following reaction. Identify the species that is oxidized or reduced.

CH

4

(

g

)

+

2

O

2

(

g

)

→

CO

2

(

g

)

+

2

H

2

O

(

g

)

1.  A solution is made by dissolving 125 g Na2SO4 in 65.0 g water.  Calculate the mole fraction of the solute and the solvent.  (MM Na2SO4 =  142 g/mole;  water = 18 g/mole)

if 6.025g of a sample of chloride salt was dissolved in water and the chloride precipitated by adding excess AgNO3. The ppt of AgNO3 was filtered, washed and dried and found to weigh 0.7134g. Calculate the percentage of chloride in the sample.

Phase diagram of Carbon dioxide

Generic Phase Diagram

A

Pressure (atm)

Temperature (°C)

JRTI

Questions:

1. Which section would be in:

a. solid phase:

b. liquid phase:

At I atm, what would be the substance s

a. boiling point:

b. melting point

c. critical temperature:

At triple point, what would be the substance's

a temperature

b. pressure:

What would you do to cause a substance to change from a solid phase to a liquid hase at constant temperature?

What would you expect to a substance melting to a liquid phase or subliming to a as at 1 atm and room temperature?

Solve in complete solution and Explain briefly:

An organic compound is known to be non-volatile and non-electrolyte. A 0.5-g sample is dissolved in water and diluted to 160 mL. The osmotic pressure is measured as 0.05 atm at 30°C. The approximate mass number for this compound is 1400 g/mol.

From the data provided in this problem and knowing that the density of the solution is 1.00 g/mL.

1. Calculate the freezing point of the solutions.

2. Determine if the freezing point change would be a good way to determine the molecular mass of the compound.

3. Would the boiling point change be a better determining factor than the freezing point change?

I conducted a galvanic cell experiment and increased the concentration of the anode (Mg) and the cathode was kept at standard conditions. I am unsure about why the cell potential decreased as the concentration of the anode increased, like how does the anode differ from cathode in terms of producing cell potential?

1.  What volume of solution (in mL) is prepared from 2.0 g NaOH (Molar Mass = 40.0 g) with a concentration of 0.6M.
2.  How many grams of water is needed to prepare 2.5% by mass of 367 g of sugar solution?