Calculating the solubility and the mole fraction of Cs2SO4.

A saturated solution contains 54.5 g Cs2SO4 in 30.0 mL of water at 25 C. What is the solubility in g solute/(100g H2O? Calculate the mole fraction of solute at this temperature.

Mercury

1. Find out 2 or 3 uses for mercury. 2. For each use find out why mercury was chosen for the job 3. What are the dangers from using mercury.

Determining what's included when calculating the heat emitted (q).

When calculating the amount of heat emitted (q): In which of these situations should you add the weight of what is added to the water, to the weight of the water itself? -17g stick of boiled metal added to water in a calorimeter. or -2g of NaOH added to water to measure the heat of dissolving.

Determining which solution is more acidic.

Which is more acidic, a solution with a pH = 4.74 or a solution that has [H+] of 2.5x10-5M?

Calculating if the amount of lead in water meets safety regulations.

The National Drinking Water standard for lead is no more than 0.015ppm. If a particular water supply sample has 2.5x10-7 moles of Pb per 5.0 liters, is it suitable for drinking?

Determining volume and torr pressure.

If a gas occupies 625mL at 0 Celcius and 760 torr pressure, what will its volume be at 373 degree C and 1520 torr pressure?

Determining if the pressure will exceed its capacity if more moles are added.

A metal tank of volume 75.5L will burst if the pressure in it exceeds 50.0atm. Will this pressure be exceeded by 82.0 moles of a gas in it at 25 degrees Celsius?

Calculating the ppm of ozone in the air.

If the volume fraction of ozone in the air of a city is 5x10-7, what is the ppm of ozone in the air?

Understanding carbon 14 dating and half lives.

The age of a piece of wood from an ancient source is determined by carbon dating. The carbon-14 content of a sample of the wood is found to be one-fourth that of living trees. The half life of carbon-14 is 5730 years. How old is the piece of wood?

how many liters of.....will be produced from the reaction...

The following reaction is used in laboratories to produce oxygen: 2KclO3 (s)  2KCl (s) + 3O2 (g) At 25 degrees Celsius and one atmosphere pressure, how many liters of O2 gas will be produced from the reaction of 165g of KClO3? See attachment for better equation.