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The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later?
Take element Z = 57 from the periodic table. Ionize it 56 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the electron
2c8h18g 25o2g --gt 16co2g 18h2og0.400 mol of octane is allowed to react with 0.600 mol of oxygen. which is the
An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 7565 J. What is the specific heat of the gas
Silver nitrate reacts with ferric chloride to give silver chloride a ferric nitrate. In a particular expriment, it was planned to mix a solution .
Calculate the average induced voltage between the tips of the wings of an airplane flying 10,000m above West Haven at a speed of 1080 km/h. The wingspan of the airplane is 36.6 m, the Earth's magnetic field in West Haven is 5.5×10-5 T and the dip ..
During evaporation, molecules escape from the surface of a liquid and enter the gas phase. This physical change requires an energy input: a molecule cannot become gaseous unless it has sufficient energy to break free of its interactions with neigh..
2C8H18(l) + 25O2(g) => 16CO2(g) + 18H2O(l) ?H = -11,200. kJ Standard enthalpies of formation, ?Hf: CO2(g), -393.5 kJ/mol; H2O(l), -285.8 kJ/mol Use the above data to calculate the standard enthalpy of formation of octane, C8H18(l).
Predict the stereochemistry of the products formed if the addition of bromine to fumaric acid occurs via
A balloon filled with H2(g) at STP has a volume of 2.24 .What is the final gas volume if 0.10 mol He(g) is added to the balloon and the temperature is then raised to 92.0 celsius while the pressure and amount of gas are held constant?
you perform combustion analysis on 255 mg of a molecule that contains only c h and o and you find that 561 mg co2 is
Iit decomposes into Cl2 gas and SO2 gas. If 13.5g of SO2Cl2 is initially placed in a 2.20L container at 435K, calculate the concentration of SO2Cl2 at equilibrium. Kc=2.50 * 10^-3
Calculate DE, and determine whether the process is endothermic or exothermic for the following cases: A system releases 29 kJ of heat to the surroundings and does 226 kJ of work on the surroundings.
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