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1) Technetium-99 is a long-live radioactive isotope of technetium. Each nucleus decays by emitting one beta particle. What is the product nucleus?
How many grams of methanol must be added to 7.50kg of water to lower its freezing point to -15.0^circ C? For each mole of solute, the freezing point of 1 {rm kg} of water is lowered 1.86 ^circ {rm C}
If a solution containing 61.402 g of mercury(II) perchlorate is allowed to react completely with a solution containing 17.796 g of sodium sulfate, how many grams of solid precipitate will be formed?
Do the three staggered/eclipsed conformations of butane have the same ENERGY?
Why are fluorescence measurements made at 90 degrees from the incident beam in most cases? 3. What is the ideal cuvette placement to avoid pre- and post-filter effects?
A sample of nitrogen gas had a volume of 500. mL, a pressure in its closed container of 740.0 torr and a temperature of 25.0°C.
The concentrated sulfuric acid is 98.0 percent h2so4 by mass. the density of the solution is 1.83 g/ml. the molar mass of h2so4 is 98.08 g/ml.What is the mass of h2so4 in 100.0g of concentrated sulfuric acid solution?
The reaction 2NO2(g)-----2NO(g)+O2(g) was studied at 383dgree c and the following data was obtained?
A year later a single large crystal of mass 50 g is at the bottom of the flask. Explain how this experiment provides evidence for a dynamic equilibrium between the saturated solution and the undissolved solute.
What are the relative populations of these levels at the boiling if the degeneracy level is 2j+ 1? Is the ground state most highly populated level?
If 116g of butane burns in the presence of 320g of oxygen how much carbon dioxide will be produced
What are the concentrations of HSO4-, SO42-, and H+ in a 0.27 M KHSO4 solution? (Hint: H2SO4 is a strong acid; Ka for HSO4- = 1.3 10-2.).
What would be the diameter, in cm, of a uranium round shot which has exactly twice the weight as the iron ball described above? 1 pound = 0.4536 kg.
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