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the average total salt concentration in the Atlantic ocean is 0.60 M (at 25?C). the concentrations of the four main individual ionic compouns are 0.48 M NaCl, 0.090 M MgCl2, 0.0250 M CaCl2 and 0.0050 M KCl. what is the total mass of salt in one liter of seawater?
When 5.25 g of sodium oxalate is reacted with 5.25 g of calcium chloride, how many grams of sodium chloride and calcium oxalate are formed?
Why does phenolphtalein change colour during the production of gas?
The distance between layers in a crystal is 323 pm. X rays are diffracted from these layers at an angle of 13.1°. Assuming that n = 3, calculate the wavelength of the X rays in nm.
What is the total mass of each of these elements in the Earth's crust (1 t = 1000kg)?
If you set the freezing point of oleic acid as 0 and the boiling point as 130, what is the freezing point of water on this new scale?
Assuming that a neutron star has the same density as a neutron, calculate the mass in kilograms of a small piece of a neutron star the size of a spherical pebble with a radius of 0.10 mm.
What is the system? What is the surrounding? In what direction does the heat flow? Is the process endothermic or exothermic?
A certain gas has a volume of 200 dm3 at 27oC and 2 atmospheres of pressure. What is its volume at STP?
Which of the following statements related to kinetic-molecular theory of gases is correct for an ideal gas? A. Gas particles move in a zigzag pattern until they collide with something.
Write a balanced equation for the reaction of NaCH3COO and HCl. Express your answer as a chemical equation. Identify all of the phases in your answer. Enter no reaction if no precipitate is formed.
What are the molar enthalpy and total enthalpy of the pure system when 50% and 75% have been evaporated at: (i) 30°C, (ii) 50°C? Use liquid at 25°C as a reference state
a star is estimated to have a mass of 2*10´36 kg. Assuming it to be a sphere of average radius 7 * 10´5 km, calculate the average density of the star in units of grams per cubic centimeter.
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