General Chemistry Answers

What is the equilibrium constant of 4HI(g)-2H(g)+2I2(g) if K has the value of 2.5 for the reaction . ASAP PLEASEE

2. Calculate the AH for the reaction:

CS2 (1) + 2 O2 (g) CO2 (g) + 2 SO2 (g)

Given:

AHCO2 (g) = -393.5 kJ/

mol;

AHSO2 = -296.8 kJ/mol;

AHCS2 (1) = 87.9kJ/mol

2. Calculate the AH for the reaction:

CS2 (1) + 2 O2 (g) CO2 (g) + 2 SO2 (g)

Given:

AHCO2 (g) = -393.5 kJ/

mol;

AHSO2 = -296.8 kJ/mol;

AHCS2 (1) = 87.9kJ/mol

A 250.0 mL of a 0.500 M HCl solution needs to be made from concentrated HCl. How much water would you add to make the final solution?

1. How many NaCI will dissolve in water in 400g of water at 100 degrees Celsius?

2. Approximately how many grams of NaNO3 will dissolve in 100g of water at 10 degrees Celsius?

3. How many grams of KCI will dissolve in 1 liter of H2O at 50 degrees Celsius?

4. What relationship exists between solubility and temperature for most of the substances shown?

169cm^3 of hydrogen were collected over water at 20°c and 755 mmHg. The saturated vapour pressure of water at 20°c is 17 .5 mmHg. What will be the volume of the hydrogen at s.t.p

How should the concentration of a colour sample be determined

1. An organic compound is known to be nonvolatile and non-electrolyte. A 0.35- g sample is dissolved in water and diluted to 150mL. The osmotic pressure is measured as 0.04 atm at 25ºC. The approximate mass number for this compound is 1400g/mol. From the data provided in this problem and knowing that the density of the solution is 1.00g/mL

a. Calculate the freezing point of the solutions

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

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

Salt is often used to melt ice and snow on roads in the winter and the temperature right now is -4.500ºC. How much NaCl (complete dissociation) would be necessary to melt 1000kg of ice by bringing down the freezing temperature to - 4.500ºC?

A solution was produced by dissolving 3.75 g of a nonvolatile solute in 95g of acetone. The boiling point of pure acetone was observed to be 55.95 ºC, while the boiling point of the solution was 56.50ºC. If the boiling point for acetone is 1.71ºC/m, what is the approximate molar mass of solute?

Step 1: First compute the molality of the boiling point equation.

Step 2. Then, from the definition of molality, compute the number of moles solute, n(solute), in the sample.

Step 3. Solve for the molar mass.