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To cool a volume of water from 176° K to 100° K, 7.9 x 104 J of heat energy must be removed. What is the volume of water that was cooled?
calculate the molar solubility of calcium carbonate in 0.050 molar calcium chloride and ksp for calcium chloride is 3.8X10^-9.
C2H5OH (l) + 3O2(g) ---------> 2CO2(g) + 3H2O(l) ?H = - 1.37 x 103 kJ When a 24.8-g sample of ethyl alcohol (molar mass = 46.07 g/mol) is burned, how much energy is released as heat?
What is the most appropriate temperature for storing your protein between purification steps? a) Room temperature b) 4° C c) -20° C d) -80° C
The temperature of 55.6 g of a material decreases by 14.8C when it loses 3080 J of heat. What is its specific heat?
1.00 mol of phosphorus reacted with excess fluorine: P4 + 6F2 -> 4PF3 Calculate the number of moles of PF3 produced, assuming the reaction went to completion
Supppose that a 1 L solution is made from 226 mg of citric acid (C6H8O7).What is the molarity of citric acid?
A 0.300 M solution of an acid, HZ, has a pH = 1.301. What is the value of the ionization constant, Ka, for this acid?
By what factor (how many times) will the rate constant increase when the temperature is raised from 10°C to 28°C?
Tris is widely used in a biochemical laboratory. Its acid dissociation constant is 8.32 x 10^-9. You have available at your lab bench a 0.1 M solution of Tris in its protonated form, 0.1 M solution of HCL and NaOH,
When 6.533 g of silver nitrate reacts with excess aluminum, how many grams of silver metal and aluminum nitrate forms?
In most instrumental or analytical methods, use of an Internal Standard is considered the least desirable approach for calibrating the method
Oxygen gas is collected by water displacement from the reaction of sodium peroxide and water. The oxygen gas displaces 318 ml of water at 23 degrees C and 1 atm. What is the pressure of the dry oxygen gas?
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