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Potassium-40 decays into argon-40 by electron capture with a half-life of 1.28x10^9 years. THis decay forms the basis of the potassium-argon dating method that is used with igneous rocks. This method assumes that no argon was trapped in the rock when it was formed frothe molten material. A meteorite was found to have equal amounts of 40K and 40Ar. a) Of the potassium-40 that was originally present, what fraction has decayed? b) how long ago was this meteorite formed
Suppose we doubled the volume of the solution (by adding more solvent) while keeping the quantities of the reactants constant in a SN1 reaction.
barium hydroxide solution PH = 10.5 is needed. How many grams of Barium hydroxide are needed
what is the enthalpy change per mole of ethanol combusted? The specific heat capacity of water is 4.184 J/g×K and the molar mass of ethanol is 46.07 g/mol.
When 35.6 L ammonia and 40.5 L oxygen gas react at STP, NO(g) and water are produced. How many grams of NO(g) are produced assuming 100% yield?
When a 2.691 g sample of the unknown organic compound is vaporized at 90.0(degrees)C and 708. mmHg it is found to occupy a volume of 1.00L.
Phenolphthalein is one of the most common indicators. What are its colors in acidic and in basic solutions?
When 0.455g of Thyroxine is dissolved in 10.0g of benzene, the freezing point of the solution is depressed by 0.3000C. What is the molar mass of Thyroxine?
what is the required time at 675 degrees celsious to have only 25% Austenite left during the transformation from Austenite to Pearlite?
A chemist needs to determine the concentration of a solution of nitric acid HNO3, She puts 865mL of the acid in a flask along with a few drops of indicator. She then slowly adds 0.600M Ba(OH)2 to the flask until the solution turns pink, indicating..
Suppose you have two solutions to titrate with NaOH: (a) 10mL of 0.1 M HCl and (b) 10 mL of 0.1 M CH3COOH.
how much dry solute would you take to prepare each of the following soluions from the dry solute and the solvent? Part A. 124ml of 0.555M KCl. Part B 10g of .530m KCl. Part C 107g of 5.4% KCl solution by mass.
suppose the hydrate was heated too quickly and some of it was lost as it spattered out of the container . explain how this would effect .
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