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1. Element A has two naturally occurring isotopes forms that has the masses 108.905 amu and 106.905 amu. What will be the average atomic mass of element A if percentage abundance of these two isotopes are 48.17 % and 51.83 % respectively. ?
2. Fe3Cl3 is mixed to remove excess phosphate from the effluent At a waste water treatment plant. the given reaction is FeCl3 -> Fe3+ + 3Cl- ;Fe3+ + PO43- -> Fe PO4; for this process Determine what concentration of Fe3+ is required to maintain the concentration of phosphate below the limit of 1 mg P/L? Given that the equilibrium constant for the second reaction = 10^26.4. Ksp = 10^-26.4 (for the reverse reaction)
Determine how many grams of aluminum hydroxide will get from 18.2g of aluminum sulfide and determine the density of this newly minted penny
What is the molar heat of vaporiza-tion of C6H6 if the vapor pressure of C6H6 is 120 torr at 27 degree celsius, and its normal boiling point is 80.1 degree celcius.
Find the mass of the substance and the volume of a gas in a reaction - determine the mass of solid ammonium nitrate that must be used to obtain 0.145 L of dinitrogen oxide gas at STP.
Find the volume of a molar solution and What volume of a 2.00 molar solution of sulfuric acid, H 2 SO 4 , is required to react with 250.0g of magnesium carbonate, MgCO 3 , according to the following equation?
Gas stoichiometry and Percentage of calcium carbonate in the sample
If a sample of sodium is dropped into a container of water the reaction is:
Find the pH solution & Hydronium ion concentration and What is the pH of a solution of 0.17 M acid and 0.81 M of its conjugate base if the pKa = 8.62?
Find the lowest temperature of vaporization and the highest temperature when there is liquid left over and Determine the range of temperatures which could be used for this process.
Determine the mass in gms for pure Ag sample that loses 2.88kJ if its temperature drops from 143 degree celsius to 28 degree celsius.?
CHEM 354 Extended Problems, The variation of EMF for the cell below with temperature is shown in the graph below.
Calculate the mass in grams for a sample of Al that absorbs 1.70kJ when the temperature increases from 56 degree Celsius to 177 degree Celsius?
A distance of 200 ft must be taped in a manner to ensure a standard deviation smaller than ± 0.03 ft. What must be the standard deviation per 100 ft tape length to achieve the desired precision?
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