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An atom makes a transition from an excited state with a lifetime of 10^-9 seconds to the ground state and emits a photon with a wavelength of 600nm. What is the uncertainty in the energy of the excited state? What is the percentage uncertainty if the energy is measure from the ground state
When determining the number of milliliters of mercuring with the density of 13.6 g/mL and having a mass of 501 g, do you divide 13.6 by 501?
How many moles of aluminum atoms, Al, are needed to combine with 0.133 mol of O atoms to make aluminum oxide, Al2O3?
a 26.0 ml sample of a liquid was found to have a mass of 13.0g. what is the density of the liquid?
What must be the concentration of PO43- to just start precipitation of Ag3PO4 in a 0.10M AgNO3 solution?
The efficiency of light source = energy of visible light/ total energy 7. What is the relationship between light intensity and distance from the source?
How many protons are required to heat 200mL of coffee from 22 degrees Celsius and 64 degrees Celsius
What is the value of Kc if the extent of dissociation in 0.100M lactic acid is 3.65% at 25 Degree C?
KHP is an acid that is monoprotic and hardly hygroscopic. When carbon dioxide reacts with NaOH it produces sodium carbonate. I kind of understand how to do part b but i really don't understand how to do part a.
how efficient is the extraction of tea leaves containing 1.0g of caffeine with two 30mL portions of chloroform over that of a single-step extraction? KD= 8.36 at 25 C)
Many gases are shipped in high-pressure containers. Consider a steel tank whose volume is 65.0L and which contains O2 gas at a pressure of 16,500kPa at 23°C.
Calculate the pH of 9.2E-8 M NaOH, ignoring activity coefficients. Report the pH using the correct number of decimal places.
What is the pH of buffer that consist of 0.20 M NaH2PO4 and 0.40 M Na2HPO4? Ka=6.2x10^-8
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