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Carbon-14 has a half-life of 5730 years. A sample of carbon with a mass of 0.120 g has an activity of 40 decays/hr. The initial specific activity is assumed to have been 900 decays/hr/gram. How old is the sample
What will be the theoretcal yield of tungsten(s) ,W, if 45.0 g of WO3 combines as completely as possible with 1.50 g of H2? WO3(s) + 3H2(g) => W(s) + 3 H2O(g)
Write ionic and net ionic equations for the following reactions. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.)
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m.
The equilibrium constant, Kp, for the following reaction is 0.497 at 500 K: PCl5(g) PCl3(g) + Cl2(g) Calculate the equilibrium partial pressures of all species when PCl5(g)
Calculate the final temperature of 32 mL of ethanol initially at 11 degrees C upon absorption of 562 J of heat.
What is the maximum wavelength of light capable of removing an electron from a hydrogen atom in the energy states characterized
calculate the energy absorbed when 2.67 moles of ethyl ether undergo combustion: CH3CH2OCH2CH3(l) + 6O2(g)-> 4CO2(g)+5H2O(l) delta H=+1604 kJ/mol
Would your calculation of the atomic mass of the metal be too high or too low if your hot metal sample cooled off, unbeknownst to you, while being transferred to the calorimeter?
What is the relationship between the standard cell potentials, E, for the following two galvanic cell reactions?
at 986°C is 0.63. A rigid cylinder at that temperature contains 1.2 atm of carbon monoxide, 0.20 atm of water vapor, 0.30 atm of carbon dioxide, and 0.27 atm of hydrogen. Is the system at equilibrium?
A reaction was conducted in benzene as the solvent. Because the reaction was very exothermic, the mixture was cooled in a salt-ice bath. This was a bad choice. Why?
The following compounds undergo McLafferty rearrangement in the mass spectrometer. Predict the masses of the resulting charged fragments for each of the following compound.
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