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A hypothetical element, Z, has two stable isotopes. Z-38 = 38.012 u 75.68% Z-46 = 45.981 u 24.32% The element's atomic mass would be closest to which of the elements? K, Ar, Ca
Barium azide is 62.04% Ba and 37.96% N by mass. Assuming that barium exists as its most stable cation in the above compound, what is the molecular formula of barium azide, how many nitrogen atoms compose an azide ion, what is the charge on an azid..
Assuming that prior experiments have shown the single-step extraction removes only 71.0 % of the ethanol, what is the mass of ethanol in your original unknown?
The solubility of an ionic compound M2X3 (molar mass = 200. g) is 2.3 multiplied by 10-17 g/L. What is Ksp for the compound?
Consider a process carried out on 1.00 mol of a monatomic ideal gas by the following pathway from state A to state B
A compound has 2 ionizable groups, with pKas of 6.2 and 9.5. A 1.0 M solution of this compound (100 mL total volume) is found to have a pH of 6.8. A biochemist adds 60 mL of 1.0 M HCl to this solution. The solution pH is now:
Determine the mass in grams of Ni in the original sample? Determine the weight percent of Ni in the sample?
Predict the geometry of the following species using the VSEPR model. electron domain and molecular geometry.
Which kind of properties are primarily affected by small amounts of impurities in semiconductor crystals
2.58g of a gas has a volume of 3.97L at 745mmHg and 21 degrees celcius. What is the molecular weight of the gas?
What is the boiling point of water at an altitude where the ambient air pressure is 0.61 bar? The enthalpy of vaporization of water near its boiling point is 40.7 kJ/mol.
A membrane distillation unit is used to remove water and lactose from milk. In the unit warm milk flows through the inside of a bundle of fibres and a cold fluid which consists of water and lactose flows on the outside of the fibres.
An unknown solution forms a white precipitate when treated with 6 M HCl. The precipitate is incompletely soluble in hot water but dissolves completely in NH3
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