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The half-life of Sr-90 is 29 years. What fraction of the atoms in a sample would remain after 100 years. How would you compute this
What is the strongest type of intermolecular force in the following compounds? dipole-dipole, london desperison or hydrogen bounding
What are the differences between sub-energy levels and orbitals? (My professor said they were different.)
the enthalpy change is 25.8 KJ. How many grams of H2 gas are produced? and d: How many KJ of heat are released when 50.9 g of CO gas reacts completely with H2 to form CH3 OH at constant pressure?
The sample is not completely thermally decomposed in the procedure. Will the mole ratio of CaO to CO2 be too high or too low? Explain
Calcium concentrations in solutions may be determined by a complex-forming reaction with EDTA. The reaction takes place between Ca2+ and EDTA4- with a formation constant of 4.5 x1010.
If the heat of combustion for a specific compound is -1390.0 kJ/mol and its molar mass is 94.11 g/mol, how many grams of this compound must you burn to release 256.70 kJ of heat
A saturated solution of magnesium hydroxide (Mg(OH)2) in equilibrium with undissolved solid is prepared at 25°C. The pH of the solution is 11.03. Calculate the value of the Ksp.
What is the concentration of Cu2+ in the following cell at 25 degrees C if the cell voltage is 0.955V?
determine what is the observed rate for the given reaction 2 o3g -rarr 3 o2g has an empirically determined rate law
The number of nuclei decaying in a sample of Gallium-68 decreased by a factor of 4 over a period of 136.6 minutes. What is the half life of this isotope
Magnesium hydroxide, the active ingredient in milk of magnesia neutralizes stomach acid , primarily HCL, according to the reaction: Mg (OH)2 (aq) + 2 HCL(aq) ---> 2 H2 O (l) + Mg(OH)2(aq).
a metal sample weighing 45.0 grams and at a temperature of 99.1 degrees celsius was placed in 38.6 grams of water in a
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