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Cesium-137 has a half-life of 30.17 years. The first atomic explosion at Trinity Site in New Mexico in 1945 generated significant amounts of cesium-137. It has been 73 years since this detonation. What fraction of the cesium-137 originally present still remains.
the proton nmr spectrum of a compound gives a singlet at ? 2.10 and ? 2.56 in a ratio of 32 respectively. which
How much material must be eroded to bring the mountains eventually down to the sea level? Use the crust and mantle densities of 2800 kg/m3
A 2.30 L sample of O2(g) was collected over a liquid at a total pressure of 785 torr and 25°C. When the O2(g) was dried (vapor of that liquid removed), the gas had a volume of 1.86 L at 25°C and 785 torr.
As per to the Bohr Theory what is the significance of full, outer electron orbits of atoms? Which chemical family has this unique property
The time to failure of printed circuit boards is modeled by the following exponential distribution probability density function
A copper penny can be dissolved in nitric acid but not in hydrochloric acid. Explain why in terms of E
When is the standard enthalpy of a reaction for which the equilibrium constant is doubled,when the temperature is increased by 10 K at 298 K
Some ice cubes at 0 degrees C with a total mass of 379g are placed in a microwave oven and subjected to 750. W (750. J/s)of energy for 5.00 minutes. (Assume all energy of the microwave is absorbed by the water and no heat loss by the water.)
Calculate the enthalpy change of the reaction for per mole potassium carbonate. Assume the specific heat of all solutions are 4.18 J/g°C and all solutions have a density=1.0 g/ml (A:-13.3 KJ) show all calculations please
a gas-filled balloon having a volume of 6.00 l at 1.2 atm and 25degc is allowed to rise to the stratosphere about 30 km
Diamonds are measured in carats, where 1 carat=0.200 g. The density of diamond is 3.51 g/cm^3. What is the volume of a 2.50-carat diamond
Why is it vital to maintain a smooth temperature gradient in the column. Explain why is it significant to maintain a uniform temperature gradient in a fractionating column
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