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What is the half-life of a compound if 89 percent of a given sample of the compound decomposes in 56 min? Assume first-order kinetics.
Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.
Draw the VSEPR diagram and classify the shape of the molecule for F2O
Give the formulas of all new molecules or ions formed when solutions of the following are mixed. If there is no reaction write "N.R." (a) Cl-, Br- , I-, Fe3+ (b) Fe2+, Br2 water
A stock solution is prepared by adding 20 mL of 1.21 M AlCl3 to enough water to make 72 mL. What is the Al3+ concentration of 30 mL of the stock solution
Acetone (nail polish remover) has a density of 0.7857 g/cm^3. a. What is the mass, in g, of 28.56 mL of acetone? b. What is the volume, in mL, of 6.54 g of acetone?
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.
What happens to the body that allows it to compensate (over this period of time) for the reduced pressure , so that the athletes will not become lightheaded?
Illustrate (draw) the thermodynamic cycles for the acid dissociation of both HCl and HF. Classify each cycle as exergonic or endergonic. Do your calculated values agree with the observed strengths of each acid in water?
Spectroscopists have observed He+ in the outerspace. This ion is a one-electron species lik ea neutral hydrogenatom. Calculate the energy emitted for the transition from the n =5 to the n = 3 state in this ion using the equation:
Platinum crystallizes with a face centered cubic lattice. The atomic radius of platinum is 0.138nm, and the atomic mass is 195.1 . (a) Calculate the lattice parameter of Pt from these data
Carbonated cola is more acidic than coffee or even orange juice because cola contains phosphoric acid.
Burning something is the combining with oxygen. Hydrocarbons, such as methane, ethane, octane (for automobiles)., combine with oxygen to form carbon dioxide and water. These combustion reactions all release energy and are all exothermic.
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