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A saturated Na2CO3 solution is prepared, and a small excess of solid is present (white pile in beaker). A seed cdrystal of Na2 14CO3 (14C is a radioactive isotope of 12C) is added (small red piece), and the radioactivity is measured over time. (a) Would you expect radioactivity in the solution? Explain. (B) Would you expect radioactivity in all the solid or just in the seed crystal? Explain.
The specific heat of aluminum is 0.21 cal g°C. How much heat is released when a 10 gram piece of aluminum foil is taken out of the oven and cools from 50 to 10 °C?
The hypothetical element, Bc, has three stable isotopes. The isotopic abundances and masses of the three isotopes are
which of the following reduces the solubility of calcium fluoride?a presence of uncommon ions such as na and cl-b
What is the internal energy (U) change of a system that emits 358 J of heat and receives 412 J of work
What is the heat change in J associated with 74 g of gaseous butane at 91 oC changing to solid at -170 oC? c(butane) (gas) = 2.31 J/ (g.K) c(butane) (liq) = 1.65 J/(g.K) c(butane) (s) = 1.32 J/ (g.K) ?Hfus(butane) = 6.885 kJ/mol
determine partial pressure and number of moles of each gas in a 17.25 L vessel at 30 degrees celsius containing a mixture of xenon and neon gases only.
What is the molarity of a solution made by dissolving 34.2 g of sodium chloride in 575 mL of solution
A volume of 110.mL of H2O is initially at room temperature (22.0 °C). A chilled steel rod at 2.00 °C is placed in the water. If the final temperature of the system is 21.1 °C , what is the mass of the steel bar?
Sulfur dioxide gas reacts with oxygen to produce gaseous sulfur dioxide. when the pressure on the reaction at equilibrium is lowered, the equilibrium will
When 1.150 grams of an unknown nonelectrolyte dissolves in 10.0 grams of water, the solution freezes at -2.16°C. What is the molecular weight of the unknown compound? Kf for water = 1.86°C/m.
Using the structure of mathyl orange as an example, draw resonance froms to show how conjugation extends throughout the molecule.
Calculate the theoretical yield percentage of a reaction between sodium and water, if 25.0 g of sodium react with excess water and if 15.5 L of gaseous hydrogen are collected at NTP conditions.
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