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How many grams of water are formed when 17.5 g of oxygen reacts with nitrogen?(hint: you need to write a balancedeqn.
How many grams of calcium are required to react with 1.55g of water to produce calcium hydroxide and hydrogengas?
Seawater contains 8.0 x 10-1 cg of the elementstrontium per kg of seawater. Assuming all of the strontium couldbe recovered, how many grams of strontium can be recovered from acubic meter of se
A rock contains .37 mg of Pb-206 and .95 mg of U-238. The half lifeof the decay series U-238 to Pb-206 is 4.5 X 109years.Assuming no Pb-206 was present in the rock initially, how old is the rock?
The solubility product ksp for mn(IO3)2 is 4.4 x 10^-7. Determine maxiumum solubility of this in moles per liter for mn(IO3)2.
A solution is made by mixing 200 mL of 5.9x10(-4)M CuCl with 150 mL of 4.3x10(-3)M NaBr. Will a CuBr precipitate form? (K(sp)=4.2x10(-8)
What mass of ammonium chloride should be added to 2.55 L of a 0.155 M NH3 in order to obtain a buffer with a pH of 9.55?
Calculate the number of moles of Cl atoms in1.20×1024 formula units of magnesium chloride,MgCl2. Express your answer numerically in moles Cl.
An important component of blood is the buffer combination of bicarbonate ion and carbonic acid. Consider blood with a pH of7.42.
If relative atomic mass of sodium is 23 and the density is 0.97 gcm -3. If the volume of one sodium atom is V , what is the value for Avogadro Constant ?
A solution of acetic acid,HC2H3O2, on a laboratory shelf wasof undetermined concentration. If the pH of the solution was found to be 2.81, what was the original concentration of the acetic acid?
Electrolysis of molten MgCl2 is the finalproduction step in the isolation of magnesium from seawater.Assuming that 37.8 g Mg metal forms, calculate the following.
How would you prepare a liter of "carbonate buffer" at a pH of10.10? you are provided with H2CO3, NaHCO3, and Na2CO3.
How much ice in grams would have to melt to lower the temperature to 468 ml of water from 39 degrees C. to 2 degrees C. (Assume the density of water is 1.00 g/ml, the heat of fusion for water at 0 d
How much heat in kilojoules is evolved in converting 36.0 g steam at 180 degrees C. to ice at -60 degrees C. (heat capacity of steam is 1.184 J/g-c & ice is 2.09 J/g-c, the heat vaporization is
If 3 mol of hydrogen is now added to the equilibrium miaxture , what is the new equilibrium concentration of ammonia ?
A red laser pointer emits light at a wavelength of 808 nm. If the laser emits 7.50E-4 J of energy per second in the form of visible radiation, how many moles of photons per second are emitted from t
When the difference in pH across the membrane of a glass electrode at 25 degrees c is 3.76 pH units, how much voltage is generated by the pH gradient if the slope of calibration is100%
How many faradays are transferred in an electrolytic cell when a current of 2.0 amperes flows for 12 hours?
HI has a normal boiling point of -35.4 degrees C, and itsΔHvap is 21.16 kJ/mol. Calculate the molar entropy of vaporization.
What are some of the possible sideproducts from an aldol condensation reaction, where abenzaldehyde reacts with an acetone molecule.
The complex [FeF6]3-has a high-spin electron configuration. How many unpaired electrons are there in the complex?
Draw the stepwise function curly arrow mechanism for the tautomerisation of propanone with (i) catalyst, H30+, and (ii) a base catalyst, HO-
How many grams of KOH must be dissolved in water to make 88.0mL of a solution, which will react with 113mL of 1.10 MCH3COOH?
A balloon with a volume of 5.87 L was filled with 2.21 mole of dry nitrogen at a temperature of 273 K. and a pressure of 705 mm Hg. What's the volume of the balloon (in L) if another 0.37 moles of g