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What is the change of energy when an electron of boron travels from the 4th energy level to the 2nd energy level?
the density of pure silver is 10.5 gcm3 at 20degc. if 6.17 g of pure silver pellets is added to a graduated cylinder
a solution of water kb0.512 c and glucose freezes at 4.15. what is the molal concentration of glucose in this solution?
For the reaction given below at 700°C, Kc = 0.534. H2(g) + CO2(g) reverse reaction arrow H2O(g) + CO(g) Calculate the number of moles of H2 that are present at equilibrium
a sample of oxygen gax occupies a volume of 250ml at 740 torr presure, what volume will it occupy at 800 torr pressure?
Isotopes Decay, Isotopes decay according to first order kinetics with a predictable half life
Fluorine-18, which has a half-life of 110 min, is used in PET scans. (see section 4.5.) If 100 mg of fluorine-18 is shipped at 8 A.M., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:..
What volume (V) of 1.80 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.87? (The pKa of acetic acid is 4.76.)
a. if the hexapeptide in question 7 is dephosphorylated then aminoethylated ae at cys and cleaved by trypsin what
determinenbsp the pressure in atm inside the can if a metal can of 1.00 qt contains 0.150 grams of helium at a
A fixed amount of gas at 35oC occupies a volume of 10.0 L when the pressure is 876 torr. Calculate the pressure in (torr) when the volume is reduced to 7.98 L at constant temperature of 35oC
Consider a triprotic system whose fully protonated form can be denoted by H3A. By definition, the fractional composition of the most basic form of the system, A3-, can be written as
Calculate how many mL of 0.100 M NaOH are needed to neutralize completely 49.0 mL of 0.0800 M H2SO4 (forming Na2SO4 and water).
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