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The freezing point of mercury is -38.8C. What quantity of energy, in joules, is released to the surroundings if 1.00 mL of mercury is cooled from 23.0C to -38.8C and the frozen to a solid?
An unknown metal hypochlorite salt, M(ClO)2, is subjected to analysis by iodometric titration: the salt is dissolved in dilute sulfuric acid, treated with excess aqueous KI,and then titrated with Na2S2O3. The unknown metal ion(M2+)
A sample of lead releases 221 kJ of heat when freezing. What is the mass of the sample? DHfus = 23 J/g
A series of lines in the spectrum of atomic hydrogen has a maximum wavelength of 7459.9 nm and then progresses to lower wavelengths. What is the wavelength of the 2nd line in the series in nm
An environmental engineer tells you that adjusting the pH to 8.5 will decrease total soluble Cr(III) to below 1 mg/L (1.92 x 10-5 M). Is this true? In other words, is the solubility of Cr(III) in the presence of Cr(OH)3(s) at a pH of 8.5 ? 1 mg/L.
How many molecules (not moles) of NH3 are produced from 2.73×10?4 of H2 ? Express your answer numerically as the number of molecules.
How many photons are required to heat 255 mL of coffee from 25 degrees celcius to 62 degrees celcius?
After he cleaned up the mess, he looked around the baby's changing table for remedies for this horrible rash, but he could not find anything. As he was about to panic, he remembered some useful acid-base chemistry from a class years ago. He opened..
Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction
Determine the maximum number of electrons that can exist in a completely filled n=5 level. Give four possible quantum numbers for a 5f electrons of the hydrogen atom
Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation
Consider the molecule cyclohexane, which contains only hydrogen and carbon atoms. When a sample is burned in oxygen, 4.822 g of CO(2) and 1.650g of H(2)O are obtained. What is its simplest formula?
a solution of ammonia and water contains 1.10times1025 water molecules and 5.00times1024 ammonia molecules. how many
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