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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)
Multiple choice questions in nuclear chemistry - which equation represents the balanced nuclear equation
Compute the heat amount required to heat a 3.9kg gold bar from 28 degree Celsius to 68 degree Celsius. Given Specific heat capacity of gold = 0.128 J/g°C.
Determine theoretical yield, limiting agent and excess reagent - How much excess reagent remains after the reaction goes to completion
Calculate the rate at each time interval & average rate for the reaction and determine the rate of each time interval, and then calculate the average rate for the reaction in terms of [H 2 O].
Determine how many grams of sodium chloride are required to prepare 250. mL of this solution. (if given the density of the saline solution is 1.0 g/mL)?
Using a sample of 30.0 mL of Kr(g), is at 25°C and 756 mmHg. Calculate the new volume if the temperature is decreased to -125°C and pressure is decreased to 325 mmHg .
Evaluate the operating conditions of the chiller - what temperature must the chiller operate if the product streams are also at 1 atm total pressure?
Using a sample of 0.385 g of Alka-Seltzer, the mass of Carbon dioxide is found to be 0.122 gram. Compute and enter response (in numerical value only) to three significant figures.
Calculate How many grams of H2O at temperature 25 degree Celsius should be poored on the ice with no water in flask initially.
Multiple choice questions in free energy change and What is the free energy change in kJ/mole?
At 25 degree celcius ,the second order reaction NOCL(g) - NO (g) + 1/2 CL2 (g) is 50 % complete after 5.82 hours when the initial concentration of Nitrosyl chloride is 4.46 ml/L.what time will it take for the reaction to be 75 % complete.
Compare alkalide ion with the neutral alkali atom - For a given alkali metal, how does the ionic radius of the alkalide ion compare to that of the neutral alkali metal atom? Explain using physical arguments.
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