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It takes 245 kJ/mol to eject electrons from a certain metal surface. What is the longest wavelength of light (nm) that can be used to eject electrons from the surface of this metal via the photoelectric effect?
find the concentration of calcium ions in a solution made by adding 3.50 g of calcium fluoride to 750ml of .125M NaF. Ksp for CaF2 is 3.95x10^-11
you have a buffer system made up of equimolar amount of carbonic acid,H2CO3, and sodium bicarbonate,NaHCO3. Write equations to show how this buffer behaves when (a) HCL is added and (b) NaOH is added.
I am given the 10 ml of .200M Fe(NO3)3 and .25 ml of .00200 KSCN and 14.75 ml of .500 M of HNO3. How do I figure out the initial concentration of FE3+ and SCN-.
Calculate the mass percent of methanol, ethanol, and MTBE, that must be present in gasoline to yield a mixture of 1.8% oxygen by weight.
A 1.000 g sample of a compound containing C, H and O is burned in excess oxygen, producing 1.783 g CO2 and 0.734 g H2O. Determine the empirical formula of the compound.
if a plant produces 5.06 mol of C6H12O6, how many moles of CO2 are needed?
what we observed that 1.00 mole Hydrogen, 1.00 mol Iodine and 1.00 mole hydrogen iodide are introduced into a container of capacity 1.00-L. compute the concentrations of each species if equilibrium is reached?
Calculate the amount of heat liberated (in kJ) from 325 g of mercury when it cools from 81.9°C to 10.0°C.
In the event of a severe and prolonged shortage of petroleum, suggest one alternative fuel that could be used for automobiles. What do you see as the advantages and disadvantages of your choice of alternative fuel?
A 2.5M solution of hydrocyanic acid has a measured pH of 4.5. Calculate the Ka for hydrocyanic acid and its % dissociation.
The relationship (if any) of the lattice energy of compounds such as ZnO vs. H3BO3 vs. their respective solubilities. For instance, at neutral pH and standard conditions
when 31g of phosphorus reacts with oxygen, 71g of an oxide phosphorus is the product. What mass of oxygen is needed to produce 13g of this product?
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