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A 20.0 g ice, initially at 0 oC is melted in 50.0 g of water that was initially at 25oC . After the ice is melted, the equilibrium temperature is 12.5oC. The specific heat of water is 4.186 J/g.oC and that of ice is 2.093 J/g.oC). Calculate a) heat lost by water, and 2) heat gained by the ice cube after it melts.
Iodine-131 has a half-life of 8 days. If you started with a 12.0-mg sample of I-131, how much would remain after 24 days? Plutonium-239 is a byproduct of the fission reaction used to produce energy in nuclear power reactors. It has a half-life of 24,..
what is the intermediate of the photochemical isomerization of (E,E)-2,4-hexadiene to (Z,E)-2,4-hexadiene ? Draw the structure of this nternediate
What two predominant effects govern most chemical reactions and properties? What are the two major types of computational approaches used to model chemicals
Tincture of iodine is I2(s) dissolved in ethanol, C2H2OH. A 1% solution of tincture of iodine is 10.0g of solute for 1000g of solution.
A sample of a gas has a pressure of 820 torr at 283°C. To what Celsius temperature must the gas be heated to triple its pressure if there is no change in the volume of the gas
Hydrogen gas has a Henry's law constant of 7.8 x 10 -4 mol/kgxbar at 25 C when dissolving in water. If the total pressure of gas (H2 plus water vapor) is 1.00 bar over water, what is the concentration of H2 in the water in g/mL
How high must a waterfall be for the water to change temperature by 0.1K during its fall (assuming no evaporation)
Calculate the number of moles of benzaldehyde and thiamine hydrochloride used in the Procedure. Explain why benzaldehyde is used for the theoretical yield calculation
The value of heat of reaction for the following reaction is -6535 kJ. What will the amount of heat in kJ evolved during the combustion of 13.1 grams of C6H6? The value of heat of reaction for the following reaction is -6535 kJ. What will the a..
How many grams of sodium sulfide are formed if 28.25 g of hydrogen sulfide is bubbled into a solution containing 34.06 g of sodium hydroxide, assuming the limiting reagent is completely consumed
What happens to the absorbance at the analytical wavelength for P of the mixture as the reaction progresses?
100 million automobiles, each containing kg of CFC-12 (CF2Cl2). If each of them releases 25% of its CFC-12 into the atmosphere per year how much cl in kilograms is added to the atmosphere
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